File: wp-includes/functions.php
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functionwp_fast_hash()
Returns a cryptographically secure hash of a message using a fast generic hash function.
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functionwp_verify_fast_hash()
Checks whether a plaintext message matches the hashed value. Used to verify values hashed via wp_fast_hash().
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functionwp_unique_id_from_values()
Generates a unique ID based on the structure and values of a given array.
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functionwp_is_heic_image_mime_type()
Checks if a mime type is for a HEIC/HEIF image.
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functionwp_get_wp_version()
Returns the current WordPress version.
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functionis_utf8_charset()
Indicates if a given slug for a character set represents the UTF-8 text encoding. If not provided, examines the current blog’s charset.
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functionwp_is_serving_rest_request()
Determines whether WordPress is currently serving a REST API request.
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Filters the arguments for an admin notice.
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Filters the markup for an admin notice.
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functionwp_admin_notice()
Outputs an admin notice.
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hookwp_admin_notice
Fires before an admin notice is output.
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functionwp_get_admin_notice()
Creates and returns the markup for an admin notice.
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functionwp_unique_prefixed_id()
Generates an incremental ID that is independent per each different prefix.
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functionwp_trigger_error()
Generates a user-level error/warning/notice/deprecation message.
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Fires when the given function triggers a user-level error/warning/notice/deprecation message.
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Fires when a deprecated class is called.
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Filters whether to trigger an error for a deprecated class.
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function_deprecated_class()
Marks a class as deprecated and informs when it has been used.
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Fires after a cache group `last_changed` time is updated.
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Filters the memory limit allocated for WP-Cron event processing.
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functionwp_cache_set_last_changed()
Sets last changed date for the specified cache group to now.
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function_validate_cache_id()
Checks whether the given cache ID is either an integer or an integer-like string.
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functionwp_recursive_ksort()
Sorts the keys of an array alphabetically.
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functionwp_filesize()
Wrapper for PHP filesize with filters and casting the result as an integer.
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hookpre_wp_filesize
Filters the result of wp_filesize before the PHP function is run.
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hookwp_filesize
Filters the size of the file.
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functionwp_json_file_decode()
Reads and decodes a JSON file.
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Returns first matched extension for the mime-type, as mapped from wp_get_mime_types().
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function_wp_check_alternate_file_names()
Helper function to test if each of an array of file names could conflict with existing files.
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function_wp_array_set()
Sets an array in depth based on a path of keys.