Hello psalm

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

.github/workflows/static-code-analysis.yml

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+name: Static code analysis
+
+on: [pull_request]
+
+jobs:
+    static-code-analysis:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - name: Checkout submodules
+              shell: bash
+              run: |
+                auth_header="$(git config --local --get http.https://github.com/.extraheader)"
+                git submodule sync --recursive
+                git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+            - name: Remove composer.json
+              shell: bash
+              run: rm composer.json composer.lock
+            - name: Psalm
+              uses: docker://jakzal/phpqa:php7.4-alpine
+              with:
+                  args: psalm --monochrome --no-progress --output-format=text

build/stubs/apcu.php

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+<?php
+
+/**
+ * Stubs for APC (apcu_bc nowadays) extension
+ */
+
+/**
+ * @link https://php.net/manual/en/apc.constants.php
+ */
+define('APC_BIN_VERIFY_MD5', 1);
+/**
+ * @link https://php.net/manual/en/apc.constants.php
+ */
+define('APC_BIN_VERIFY_CRC32', 2);
+
+/**
+ * Retrieves cached information and meta-data from APC's data store
+ * @link https://php.net/manual/en/function.apc-cache-info.php
+ * @param string $type If cache_type is "user", information about the user cache will be returned.
+ * If cache_type is "filehits", information about which files have been served from the bytecode
+ * cache for the current request will be returned. This feature must be enabled at compile time
+ * using --enable-filehits. If an invalid or no cache_type is specified, information about the
+ * system cache (cached files) will be returned.
+ * @param bool $limited If limited is TRUE, the return value will exclude the individual list
+ * of cache entries. This is useful when trying to optimize calls for statistics gathering.
+ * @return array|bool Array of cached data (and meta-data) or FALSE on failure.
+ */
+function apc_cache_info($type = '', $limited = false){}
+
+/**
+ * Clears the APC cache
+ * @link https://php.net/manual/en/function.apc-clear-cache.php
+ * @param string $cache_type If cache_type is "user", the user cache will be cleared;
+ * otherwise, the system cache (cached files) will be cleared.
+ * @return bool Returns TRUE on success or FALSE on failure.
+ */
+function apc_clear_cache($cache_type = ''){}
+
+/**
+ * Retrieves APC's Shared Memory Allocation information
+ * @link https://php.net/manual/en/function.apc-sma-info.php
+ * @param bool $limited When set to FALSE (default) apc_sma_info() will
+ * return a detailed information about each segment.
+ * @return array|bool Array of Shared Memory Allocation data; FALSE on failure.
+ */
+function apc_sma_info($limited = false){}
+
+/**
+ * Cache a variable in the data store
+ * @link https://php.net/manual/en/function.apc-store.php
+ * @param string|array $key String: Store the variable using this name. Keys are cache-unique,
+ * so storing a second value with the same key will overwrite the original value.
+ * Array: Names in key, variables in value.
+ * @param mixed $var [optional] The variable to store
+ * @param int $ttl [optional]  Time To Live; store var in the cache for ttl seconds. After the ttl has passed,
+ * the stored variable will be expunged from the cache (on the next request). If no ttl is supplied
+ * (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @return bool|array Returns TRUE on success or FALSE on failure | array with error keys.
+ */
+function apc_store($key, $var, $ttl = 0){}
+
+/**
+ * Fetch a stored variable from the cache
+ * @link https://php.net/manual/en/function.apc-fetch.php
+ * @param string|string[] $key The key used to store the value (with apc_store()).
+ * If an array is passed then each element is fetched and returned.
+ * @param bool $success Set to TRUE in success and FALSE in failure.
+ * @return mixed The stored variable or array of variables on success; FALSE on failure.
+ */
+function apc_fetch($key, &$success = null){}
+
+/**
+ * Removes a stored variable from the cache
+ * @link https://php.net/manual/en/function.apc-delete.php
+ * @param string|string[]|APCIterator $key The key used to store the value (with apc_store()).
+ * @return bool|string[] Returns TRUE on success or FALSE on failure. For array of keys returns list of failed keys.
+ */
+function apc_delete($key){}
+
+/**
+ * Defines a set of constants for retrieval and mass-definition
+ *
+ * define() is notoriously slow. Since the main benefit of APC is to increase
+ * the performance of scripts/applications, this mechanism is provided to streamline
+ * the process of mass constant definition. However, this function does not perform
+ * as well as anticipated. For a better-performing solution, try the hidef extension from PECL.
+ *
+ * @link https://php.net/manual/en/function.apc-define-constants.php
+ * @param string $key The key serves as the name of the constant set being stored.
+ * This key is used to retrieve the stored constants in apc_load_constants().
+ * @param array $constants An associative array of constant_name => value pairs.
+ * The constant_name must follow the normal constant naming rules. Value must evaluate to a scalar value.
+ * @param bool $case_sensitive The default behaviour for constants is to be declared case-sensitive;
+ * i.e. CONSTANT and Constant represent different values. If this parameter evaluates to FALSE
+ * the constants will be declared as case-insensitive symbols.
+ * @return bool Returns TRUE on success or FALSE on failure.
+ */
+function apc_define_constants($key, array $constants, $case_sensitive = true){}
+
+/**
+ * Caches a variable in the data store, only if it's not already stored
+ * @link https://php.net/manual/en/function.apc-add.php
+ * @param string $key Store the variable using this name. Keys are cache-unique,
+ * so attempting to use apc_add() to store data with a key that already exists will not
+ * overwrite the existing data, and will instead return FALSE. (This is the only difference
+ * between apc_add() and apc_store().)
+ * @param mixed $var The variable to store
+ * @param int $ttl Time To Live; store var in the cache for ttl seconds. After the ttl has passed,
+ * the stored variable will be expunged from the cache (on the next request). If no ttl is supplied
+ * (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @return bool
+ */
+function apc_add($key, $var, $ttl = 0){}
+
+/**
+ * Stores a file in the bytecode cache, bypassing all filters
+ * @link https://php.net/manual/en/function.apc-compile-file.php
+ * @param string|string[] $filename Full or relative path to a PHP file that will be
+ * compiled and stored in the bytecode cache.
+ * @param bool $atomic
+ * @return bool Returns TRUE on success or FALSE on failure.
+ */
+function apc_compile_file($filename, $atomic = true){}
+
+/**
+ * Loads a set of constants from the cache
+ * @link https://php.net/manual/en/function.apc-load-constants.php
+ * @param string $key The name of the constant set (that was stored
+ * with apc_define_constants()) to be retrieved.
+ * @param bool $case_sensitive The default behaviour for constants is to be declared case-sensitive;
+ * i.e. CONSTANT and Constant represent different values. If this parameter evaluates to FALSE
+ * the constants will be declared as case-insensitive symbols.
+ * @return bool Returns TRUE on success or FALSE on failure.
+ */
+function apc_load_constants($key, $case_sensitive = true){}
+
+/**
+ * Checks if APC key exists
+ * @link https://php.net/manual/en/function.apc-exists.php
+ * @param bool|string[] $keys A string, or an array of strings, that contain keys.
+ * @return bool|string[] Returns TRUE if the key exists, otherwise FALSE
+ * Or if an array was passed to keys, then an array is returned that
+ * contains all existing keys, or an empty array if none exist.
+ */
+function apc_exists($keys){}
+
+/**
+ * Deletes the given files from the opcode cache
+ *
+ * Accepts a string, array of strings, or APCIterator object.
+ * Returns True/False, or for an Array an Array of failed files.
+ *
+ * @link https://php.net/manual/en/function.apc-delete-file.php
+ * @param string|string[]|APCIterator $keys
+ * @return bool|string[]
+ */
+function apc_delete_file($keys){}
+
+/**
+ * Increase a stored number
+ * @link https://php.net/manual/en/function.apc-inc.php
+ * @param string $key The key of the value being increased.
+ * @param int $step The step, or value to increase.
+ * @param bool $success Optionally pass the success or fail boolean value to this referenced variable.
+ * @return int|bool Returns the current value of key's value on success, or FALSE on failure.
+ */
+function apc_inc($key, $step = 1, &$success = null){}
+
+/**
+ * Decrease a stored number
+ * @link https://php.net/manual/en/function.apc-dec.php
+ * @param string $key The key of the value being decreased.
+ * @param int $step The step, or value to decrease.
+ * @param bool $success Optionally pass the success or fail boolean value to this referenced variable.
+ * @return int|bool Returns the current value of key's value on success, or FALSE on failure.
+ */
+function apc_dec($key, $step = 1, &$success = null){}
+
+/**
+ * @link https://php.net/manual/en/function.apc-cas.php
+ * @param string $key
+ * @param int $old
+ * @param int $new
+ * @return bool
+ */
+function apc_cas($key, $old, $new){}
+
+/**
+ * Returns a binary dump of the given files and user variables from the APC cache
+ *
+ * A NULL for files or user_vars signals a dump of every entry, while array() will dump nothing.
+ *
+ * @link https://php.net/manual/en/function.apc-bin-dump.php
+ * @param string[]|null $files The files. Passing in NULL signals a dump of every entry, while passing in array() will dump nothing.
+ * @param string[]|null $user_vars The user vars. Passing in NULL signals a dump of every entry, while passing in array() will dump nothing.
+ * @return string|bool|null Returns a binary dump of the given files and user variables from the APC cache, FALSE if APC is not enabled, or NULL if an unknown error is encountered.
+ */
+function apc_bin_dump($files = null, $user_vars = null){}
+
+/**
+ * Output a binary dump of the given files and user variables from the APC cache to the named file
+ * @link https://php.net/manual/en/function.apc-bin-dumpfile.php
+ * @param string[]|null $files The file names being dumped.
+ * @param string[]|null $user_vars The user variables being dumped.
+ * @param string $filename The filename where the dump is being saved.
+ * @param int $flags Flags passed to the filename stream. See the file_put_contents() documentation for details.
+ * @param resource $context The context passed to the filename stream. See the file_put_contents() documentation for details.
+ * @return int|bool The number of bytes written to the file, otherwise FALSE if APC
+ * is not enabled, filename is an invalid file name, filename can't be opened,
+ * the file dump can't be completed (e.g., the hard drive is out of disk space),
+ * or an unknown error was encountered.
+ */
+function apc_bin_dumpfile($files, $user_vars, $filename, $flags = 0, $context = null){}
+
+/**
+ * Load the given binary dump into the APC file/user cache
+ * @link https://php.net/manual/en/function.apc-bin-load.php
+ * @param string $data The binary dump being loaded, likely from apc_bin_dump().
+ * @param int $flags Either APC_BIN_VERIFY_CRC32, APC_BIN_VERIFY_MD5, or both.
+ * @return bool Returns TRUE if the binary dump data was loaded with success, otherwise FALSE is returned.
+ * FALSE is returned if APC is not enabled, or if the data is not a valid APC binary dump (e.g., unexpected size).
+ */
+function apc_bin_load($data, $flags = 0){}
+
+/**
+ * Load the given binary dump from the named file into the APC file/user cache
+ * @link https://php.net/manual/en/function.apc-bin-loadfile.php
+ * @param string $filename The file name containing the dump, likely from apc_bin_dumpfile().
+ * @param resource $context The files context.
+ * @param int $flags Either APC_BIN_VERIFY_CRC32, APC_BIN_VERIFY_MD5, or both.
+ * @return bool Returns TRUE on success, otherwise FALSE Reasons it may return FALSE include APC
+ * is not enabled, filename is an invalid file name or empty, filename can't be opened,
+ * the file dump can't be completed, or if the data is not a valid APC binary dump (e.g., unexpected size).
+ */
+function apc_bin_loadfile($filename, $context = null, $flags = 0){}
+
+/**
+ * The APCIterator class
+ *
+ * The APCIterator class makes it easier to iterate over large APC caches.
+ * This is helpful as it allows iterating over large caches in steps, while grabbing a defined number
+ * of entries per lock instance, so it frees the cache locks for other activities rather than hold up
+ * the entire cache to grab 100 (the default) entries. Also, using regular expression matching is more
+ * efficient as it's been moved to the C level.
+ *
+ * @link https://php.net/manual/en/class.apciterator.php
+ */
+class APCIterator implements Iterator
+{
+    /**
+     * Constructs an APCIterator iterator object
+     * @link https://php.net/manual/en/apciterator.construct.php
+     * @param string $cache The cache type, which will be 'user' or 'file'.
+     * @param string|string[]|null $search A PCRE regular expression that matches against APC key names,
+     * either as a string for a single regular expression, or as an array of regular expressions.
+     * Or, optionally pass in NULL to skip the search.
+     * @param int $format The desired format, as configured with one ore more of the APC_ITER_* constants.
+     * @param int $chunk_size The chunk size. Must be a value greater than 0. The default value is 100.
+     * @param int $list The type to list. Either pass in APC_LIST_ACTIVE  or APC_LIST_INACTIVE.
+     */
+    public function __construct($cache, $search = null, $format = APC_ITER_ALL, $chunk_size = 100, $list = APC_LIST_ACTIVE){}
+
+    /**
+     * Rewinds back the iterator to the first element
+     * @link https://php.net/manual/en/apciterator.rewind.php
+     */
+    public function rewind(){}
+
+    /**
+     * Checks if the current iterator position is valid
+     * @link https://php.net/manual/en/apciterator.valid.php
+     * @return bool Returns TRUE if the current iterator position is valid, otherwise FALSE.
+     */
+    public function valid(){}
+
+    /**
+     * Gets the current item from the APCIterator stack
+     * @link https://php.net/manual/en/apciterator.current.php
+     * @return mixed Returns the current item on success, or FALSE if no more items or exist, or on failure.
+     */
+    public function current(){}
+
+    /**
+     * Gets the current iterator key
+     * @link https://php.net/manual/en/apciterator.key.php
+     * @return string|int|bool Returns the key on success, or FALSE upon failure.
+     */
+    public function key(){}
+
+    /**
+     * Moves the iterator pointer to the next element
+     * @link https://php.net/manual/en/apciterator.next.php
+     * @return bool Returns TRUE on success or FALSE on failure.
+     */
+    public function next(){}
+
+    /**
+     * Gets the total number of cache hits
+     * @link https://php.net/manual/en/apciterator.gettotalhits.php
+     * @return int|bool The number of hits on success, or FALSE on failure.
+     */
+    public function getTotalHits(){}
+
+    /**
+     * Gets the total cache size
+     * @link https://php.net/manual/en/apciterator.gettotalsize.php
+     * @return int|bool The total cache size.
+     */
+    public function getTotalSize(){}
+
+    /**
+     * Get the total count
+     * @link https://php.net/manual/en/apciterator.gettotalcount.php
+     * @return int|bool The total count.
+     */
+    public function getTotalCount(){}
+}
+
+/**
+ * Stubs for APCu 5.0.0
+ */
+
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_LIST_ACTIVE', 1);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_LIST_DELETED', 2);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_TYPE', 1);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_KEY', 2);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_FILENAME', 4);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_DEVICE', 8);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_INODE', 16);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_VALUE', 32);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_MD5', 64);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_NUM_HITS', 128);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_MTIME', 256);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_CTIME', 512);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_DTIME', 1024);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_ATIME', 2048);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_REFCOUNT', 4096);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_MEM_SIZE', 8192);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_TTL', 16384);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_NONE', 0);
+/**
+ * @link https://php.net/manual/en/apcu.constants.php
+ */
+define('APC_ITER_ALL', -1);
+
+
+/**
+ * Clears the APCu cache
+ * @link https://php.net/manual/en/function.apcu-clear-cache.php
+ *
+ * @return bool Returns TRUE always.
+ */
+function apcu_clear_cache(){}
+
+/**
+ * Retrieves APCu Shared Memory Allocation information
+ * @link https://php.net/manual/en/function.apcu-sma-info.php
+ * @param bool $limited When set to FALSE (default) apcu_sma_info() will
+ * return a detailed information about each segment.
+ *
+ * @return array|false Array of Shared Memory Allocation data; FALSE on failure.
+ */
+function apcu_sma_info($limited = false){}
+
+/**
+ * Cache a variable in the data store
+ * @link https://php.net/manual/en/function.apcu-store.php
+ * @param string|array $key String: Store the variable using this name. Keys are cache-unique,
+ * so storing a second value with the same key will overwrite the original value.
+ * Array: Names in key, variables in value.
+ * @param mixed $var [optional] The variable to store
+ * @param int $ttl [optional]  Time To Live; store var in the cache for ttl seconds. After the ttl has passed,
+ * the stored variable will be expunged from the cache (on the next request). If no ttl is supplied
+ * (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @return bool|array Returns TRUE on success or FALSE on failure | array with error keys.
+ */
+function apcu_store($key, $var, $ttl = 0){}
+
+/**
+ * Fetch a stored variable from the cache
+ * @link https://php.net/manual/en/function.apcu-fetch.php
+ * @param string|string[] $key The key used to store the value (with apcu_store()).
+ * If an array is passed then each element is fetched and returned.
+ * @param bool $success Set to TRUE in success and FALSE in failure.
+ * @return mixed The stored variable or array of variables on success; FALSE on failure.
+ */
+function apcu_fetch($key, &$success = null){}
+
+/**
+ * Removes a stored variable from the cache
+ * @link https://php.net/manual/en/function.apcu-delete.php
+ * @param string|string[]|APCuIterator $key The key used to store the value (with apcu_store()).
+ * @return bool|string[] Returns TRUE on success or FALSE on failure. For array of keys returns list of failed keys.
+ */
+function apcu_delete($key){}
+
+/**
+ * Caches a variable in the data store, only if it's not already stored
+ * @link https://php.net/manual/en/function.apcu-add.php
+ * @param string|array $key Store the variable using this name. Keys are cache-unique,
+ * so attempting to use apcu_add() to store data with a key that already exists will not
+ * overwrite the existing data, and will instead return FALSE. (This is the only difference
+ * between apcu_add() and apcu_store().)
+ * Array: Names in key, variables in value.
+ * @param mixed $var The variable to store
+ * @param int $ttl Time To Live; store var in the cache for ttl seconds. After the ttl has passed,
+ * the stored variable will be expunged from the cache (on the next request). If no ttl is supplied
+ * (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @return bool|array Returns TRUE if something has effectively been added into the cache, FALSE otherwise.
+ * Second syntax returns array with error keys.
+ */
+function apcu_add($key, $var, $ttl = 0){}
+
+/**
+ * Checks if APCu key exists
+ * @link https://php.net/manual/en/function.apcu-exists.php
+ * @param string|string[] $keys A string, or an array of strings, that contain keys.
+ * @return bool|string[] Returns TRUE if the key exists, otherwise FALSE
+ * Or if an array was passed to keys, then an array is returned that
+ * contains all existing keys, or an empty array if none exist.
+ */
+function apcu_exists($keys){}
+
+/**
+ * Increase a stored number
+ * @link https://php.net/manual/en/function.apcu-inc.php
+ * @param string $key The key of the value being increased.
+ * @param int $step The step, or value to increase.
+ * @param int $ttl Time To Live; store var in the cache for ttl seconds. After the ttl has passed,
+ * the stored variable will be expunged from the cache (on the next request). If no ttl is supplied
+ * (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @param bool $success Optionally pass the success or fail boolean value to this referenced variable.
+ * @return int|false Returns the current value of key's value on success, or FALSE on failure.
+ */
+function apcu_inc($key, $step = 1, &$success = null, $ttl = 0){}
+
+/**
+ * Decrease a stored number
+ * @link https://php.net/manual/en/function.apcu-dec.php
+ * @param string $key The key of the value being decreased.
+ * @param int $step The step, or value to decrease.
+ * @param int $ttl Time To Live; store var in the cache for ttl seconds. After the ttl has passed,
+ * the stored variable will be expunged from the cache (on the next request). If no ttl is supplied
+ * (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @param bool $success Optionally pass the success or fail boolean value to this referenced variable.
+ * @return int|false Returns the current value of key's value on success, or FALSE on failure.
+ */
+function apcu_dec($key, $step = 1, &$success = null, $ttl = 0){}
+
+/**
+ * Updates an old value with a new value
+ *
+ * apcu_cas() updates an already existing integer value if the old parameter matches the currently stored value
+ * with the value of the new parameter.
+ *
+ * @link https://php.net/manual/en/function.apcu-cas.php
+ * @param string $key The key of the value being updated.
+ * @param int $old The old value (the value currently stored).
+ * @param int $new The new value to update to.
+ * @return bool Returns TRUE on success or FALSE on failure.
+ */
+function apcu_cas($key, $old, $new){}
+
+/**
+ * Atomically fetch or generate a cache entry
+ *
+ * <p>Atomically attempts to find key in the cache, if it cannot be found generator is called,
+ * passing key as the only argument. The return value of the call is then cached with the optionally
+ * specified ttl, and returned.
+ * </p>
+ *
+ * <p>Note: When control enters <i>apcu_entry()</i> the lock for the cache is acquired exclusively, it is released when
+ * control leaves apcu_entry(): In effect, this turns the body of generator into a critical section,
+ * disallowing two processes from executing the same code paths concurrently.
+ * In addition, it prohibits the concurrent execution of any other APCu functions,
+ * since they will acquire the same lock.
+ * </p>
+ *
+ * @link https://php.net/manual/en/function.apcu-entry.php
+ *
+ * @param string $key Identity of cache entry
+ * @param callable $generator A callable that accepts key as the only argument and returns the value to cache.
+ * <p>Warning
+ * The only APCu function that can be called safely by generator is apcu_entry().</p>
+ * @param int $ttl [optional] Time To Live; store var in the cache for ttl seconds.
+ * After the ttl has passed, the stored variable will be expunged from the cache (on the next request).
+ * If no ttl is supplied (or if the ttl is 0), the value will persist until it is removed from the cache manually,
+ * or otherwise fails to exist in the cache (clear, restart, etc.).
+ * @return mixed Returns the cached value
+ * @since APCu 5.1.0
+ */
+function apcu_entry($key, callable $generator, $ttl = 0){}
+
+/**
+ * Retrieves cached information from APCu's data store
+ *
+ * @link https://php.net/manual/en/function.apcu-cache-info.php
+ *
+ * @param bool $limited If limited is TRUE, the return value will exclude the individual list of cache entries.
+ * This is useful when trying to optimize calls for statistics gathering.
+ * @return array|false Array of cached data (and meta-data) or FALSE on failure
+ */
+function apcu_cache_info($limited = false){}
+
+/**
+ * Whether APCu is usable in the current environment
+ *
+ * @link https://www.php.net/manual/en/function.apcu-enabled.php
+ *
+ * @return bool
+ */
+function apcu_enabled(){}
+
+/**
+ * @param string $key
+ */
+function apcu_key_info($key){}
+
+/**
+ * The APCuIterator class
+ *
+ * The APCuIterator class makes it easier to iterate over large APCu caches.
+ * This is helpful as it allows iterating over large caches in steps, while grabbing a defined number
+ * of entries per lock instance, so it frees the cache locks for other activities rather than hold up
+ * the entire cache to grab 100 (the default) entries. Also, using regular expression matching is more
+ * efficient as it's been moved to the C level.
+ *
+ * @link https://php.net/manual/en/class.apcuiterator.php
+ * @since APCu 5.0.0
+ */
+class APCuIterator implements Iterator
+{
+	/**
+	 * Constructs an APCuIterator iterator object
+	 * @link https://php.net/manual/en/apcuiterator.construct.php
+	 * @param string|string[]|null $search A PCRE regular expression that matches against APCu key names,
+	 * either as a string for a single regular expression, or as an array of regular expressions.
+	 * Or, optionally pass in NULL to skip the search.
+	 * @param int $format The desired format, as configured with one ore more of the APC_ITER_* constants.
+	 * @param int $chunk_size The chunk size. Must be a value greater than 0. The default value is 100.
+	 * @param int $list The type to list. Either pass in APC_LIST_ACTIVE  or APC_LIST_DELETED.
+	 */
+	public function __construct($search = null, $format = APC_ITER_ALL, $chunk_size = 100, $list = APC_LIST_ACTIVE){}
+
+	/**
+	 * Rewinds back the iterator to the first element
+	 * @link https://php.net/manual/en/apcuiterator.rewind.php
+	 */
+	public function rewind(){}
+
+	/**
+	 * Checks if the current iterator position is valid
+	 * @link https://php.net/manual/en/apcuiterator.valid.php
+	 * @return bool Returns TRUE if the current iterator position is valid, otherwise FALSE.
+	 */
+	public function valid(){}
+
+	/**
+	 * Gets the current item from the APCuIterator stack
+	 * @link https://php.net/manual/en/apcuiterator.current.php
+	 * @return mixed Returns the current item on success, or FALSE if no more items or exist, or on failure.
+	 */
+	public function current(){}
+
+	/**
+	 * Gets the current iterator key
+	 * @link https://php.net/manual/en/apcuiterator.key.php
+	 * @return string|int|false Returns the key on success, or FALSE upon failure.
+	 */
+	public function key(){}
+
+	/**
+	 * Moves the iterator pointer to the next element
+	 * @link https://php.net/manual/en/apcuiterator.next.php
+	 * @return bool Returns TRUE on success or FALSE on failure.
+	 */
+	public function next(){}
+
+	/**
+	 * Gets the total number of cache hits
+	 * @link https://php.net/manual/en/apcuiterator.gettotalhits.php
+	 * @return int|false The number of hits on success, or FALSE on failure.
+	 */
+	public function getTotalHits(){}
+
+	/**
+	 * Gets the total cache size
+	 * @link https://php.net/manual/en/apcuiterator.gettotalsize.php
+	 * @return int|false The total cache size.
+	 */
+	public function getTotalSize(){}
+
+	/**
+	 * Get the total count
+	 * @link https://php.net/manual/en/apcuiterator.gettotalcount.php
+	 * @return int|false The total count.
+	 */
+	public function getTotalCount(){}
+}

psalm.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0"?>
+<psalm
+	errorLevel="4"
+	resolveFromConfigFile="true"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns="https://getpsalm.org/schema/config"
+	xsi:schemaLocation="https://getpsalm.org/schema/config lib/composer/vimeo/psalm/config.xsd"
+>
+	<projectFiles>
+		<directory name="apps"/>
+		<directory name="core"/>
+		<directory name="lib"/>
+		<directory name="ocm-provider"/>
+		<directory name="ocs"/>
+		<directory name="ocs-provider"/>
+		<file name="index.php"/>
+		<file name="public.php"/>
+		<file name="remote.php"/>
+		<file name="status.php"/>
+		<file name="version.php"/>
+		<ignoreFiles>
+			<directory name="apps/**/composer"/>
+			<directory name="apps/**/tests"/>
+			<directory name="lib/composer"/>
+			<directory name="lib/l10n"/>
+		</ignoreFiles>
+	</projectFiles>
+	<extraFiles>
+		<directory name="3rdparty"/>
+	</extraFiles>
+	<stubs>
+		<file name="build/stubs/apcu.php"/>
+		<file name="build/stubs/imagick.php"/>
+		<file name="build/stubs/memcached.php"/>
+		<file name="build/stubs/redis.php"/>
+		<file name="build/stubs/redis_cluster.php"/>
+	</stubs>
+</psalm>