Title: Functions | Page 42 of 49 | Developer.WordPress.org --- # Functions * function[maybe_serialize()](https://developer.wordpress.org/reference/functions/maybe_serialize/) * Serializes data, if needed. * Used by [12 functions](https://developer.wordpress.org/reference/functions/maybe_serialize/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/maybe_serialize/#uses) | Source: [wp-includes/functions.php:628](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L628-L643) * function[maybe_unserialize()](https://developer.wordpress.org/reference/functions/maybe_unserialize/) * Unserializes data only if it was serialized. * Used by [10 functions](https://developer.wordpress.org/reference/functions/maybe_unserialize/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/maybe_unserialize/#uses) | Source: [wp-includes/functions.php:653](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L653-L659) * function[mbstring_binary_safe_encoding()](https://developer.wordpress.org/reference/functions/mbstring_binary_safe_encoding/) * Sets the mbstring internal encoding to a binary safe encoding when func_overload is enabled. * Used by [13 functions](https://developer.wordpress.org/reference/functions/mbstring_binary_safe_encoding/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/mbstring_binary_safe_encoding/#uses) | Source: [wp-includes/functions.php:7650](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L7650-L7678) * function[media_buttons()](https://developer.wordpress.org/reference/functions/media_buttons/) * Adds the media button to the editor. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_buttons/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/media_buttons/#uses) | Source: [wp-admin/includes/media.php:641](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L641-L683) * function[media_handle_sideload()](https://developer.wordpress.org/reference/functions/media_handle_sideload/) * Handles a side-loaded file in the same way as an uploaded file is handled by media_handle_upload(). * Used by [2 functions](https://developer.wordpress.org/reference/functions/media_handle_sideload/#used-by) | Uses [11 functions](https://developer.wordpress.org/reference/functions/media_handle_sideload/#uses) | Source: [wp-admin/includes/media.php:455](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L455-L521) * function[media_handle_upload()](https://developer.wordpress.org/reference/functions/media_handle_upload/) * Saves a file submitted from a POST request and create an attachment post for it. * Used by [2 functions](https://developer.wordpress.org/reference/functions/media_handle_upload/#used-by) | Uses [15 functions](https://developer.wordpress.org/reference/functions/media_handle_upload/#uses) | Source: [wp-admin/includes/media.php:295](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L295-L441) * function[media_post_single_attachment_fields_to_edit()](https://developer.wordpress.org/reference/functions/media_post_single_attachment_fields_to_edit/) * Retrieves the post non-image attachment fields to edit form fields. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_post_single_attachment_fields_to_edit/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/media_post_single_attachment_fields_to_edit/#uses) | Source: [wp-admin/includes/media.php:1345](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L1345-L1348) * function[media_send_to_editor()](https://developer.wordpress.org/reference/functions/media_send_to_editor/) * Adds image HTML to editor. * Used by [2 functions](https://developer.wordpress.org/reference/functions/media_send_to_editor/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/media_send_to_editor/#uses) | Source: [wp-admin/includes/media.php:273](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L273-L281) * function[media_sideload_image()](https://developer.wordpress.org/reference/functions/media_sideload_image/) * Downloads an image from the specified URL, saves it as an attachment, and optionally attaches it to a post. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_sideload_image/#used-by) | Uses [10 functions](https://developer.wordpress.org/reference/functions/media_sideload_image/#uses) | Source: [wp-admin/includes/media.php:1015](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L1015-L1092) * function[media_single_attachment_fields_to_edit()](https://developer.wordpress.org/reference/functions/media_single_attachment_fields_to_edit/) * Retrieves the single non-image attachment fields to edit form fields. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_single_attachment_fields_to_edit/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/media_single_attachment_fields_to_edit/#uses) | Source: [wp-admin/includes/media.php:1331](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L1331-L1334) * function[media_upload_audio()](https://developer.wordpress.org/reference/functions/media_upload_audio/) * Handles uploading an audio file. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_audio/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/media_upload_audio/#uses) | Source: [wp-admin/includes/deprecated.php:901](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/deprecated.php#L901-L904) * function[media_upload_file()](https://developer.wordpress.org/reference/functions/media_upload_file/) * Handles uploading a generic file. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_file/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/media_upload_file/#uses) | Source: [wp-admin/includes/deprecated.php:927](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/deprecated.php#L927-L930) * function[media_upload_flash_bypass()](https://developer.wordpress.org/reference/functions/media_upload_flash_bypass/) * Displays the multi-file uploader message. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_flash_bypass/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/media_upload_flash_bypass/#uses) | Source: [wp-admin/includes/media.php:3032](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L3032-L3044) * function[media_upload_form()](https://developer.wordpress.org/reference/functions/media_upload_form/) * Outputs the legacy media upload form. * Used by [1 function](https://developer.wordpress.org/reference/functions/media_upload_form/#used-by) | Uses [22 functions](https://developer.wordpress.org/reference/functions/media_upload_form/#uses) | Source: [wp-admin/includes/media.php:2092](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L2092-L2320) * function[media_upload_form_handler()](https://developer.wordpress.org/reference/functions/media_upload_form_handler/) * Handles form submissions for the legacy media uploader. * Used by [3 functions](https://developer.wordpress.org/reference/functions/media_upload_form_handler/#used-by) | Uses [15 functions](https://developer.wordpress.org/reference/functions/media_upload_form_handler/#uses) | Source: [wp-admin/includes/media.php:741](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L741-L864) * function[media_upload_gallery()](https://developer.wordpress.org/reference/functions/media_upload_gallery/) * Retrieves the legacy media uploader form in an iframe. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_gallery/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/media_upload_gallery/#uses) | Source: [wp-admin/includes/media.php:1101](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L1101-L1118) * function[media_upload_gallery_form()](https://developer.wordpress.org/reference/functions/media_upload_gallery_form/) * Adds gallery form to upload iframe. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_gallery_form/#used-by) | Uses [14 functions](https://developer.wordpress.org/reference/functions/media_upload_gallery_form/#uses) | Source: [wp-admin/includes/media.php:2554](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L2554-L2701) * function[media_upload_header()](https://developer.wordpress.org/reference/functions/media_upload_header/) * Outputs the legacy media upload header. * Used by [4 functions](https://developer.wordpress.org/reference/functions/media_upload_header/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/media_upload_header/#uses) | Source: [wp-admin/includes/media.php:2070](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L2070-L2080) * function[media_upload_html_bypass()](https://developer.wordpress.org/reference/functions/media_upload_html_bypass/) * Displays the browser’s built-in uploader message. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_html_bypass/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/media_upload_html_bypass/#uses) | Source: [wp-admin/includes/media.php:3051](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L3051-L3063) * function[media_upload_image()](https://developer.wordpress.org/reference/functions/media_upload_image/) * Handles uploading an image. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_image/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/media_upload_image/#uses) | Source: [wp-admin/includes/deprecated.php:888](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/deprecated.php#L888-L891) * function[media_upload_library()](https://developer.wordpress.org/reference/functions/media_upload_library/) * Retrieves the legacy media library form in an iframe. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_library/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/media_upload_library/#uses) | Source: [wp-admin/includes/media.php:1127](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L1127-L1142) * function[media_upload_library_form()](https://developer.wordpress.org/reference/functions/media_upload_library_form/) * Outputs the legacy media upload form for the media library. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_library_form/#used-by) | Uses [25 functions](https://developer.wordpress.org/reference/functions/media_upload_library_form/#uses) | Source: [wp-admin/includes/media.php:2717](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L2717-L2919) * function[media_upload_max_image_resize()](https://developer.wordpress.org/reference/functions/media_upload_max_image_resize/) * Displays the checkbox to scale images. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_max_image_resize/#used-by) | Uses [6 functions](https://developer.wordpress.org/reference/functions/media_upload_max_image_resize/#uses) | Source: [wp-admin/includes/media.php:3077](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L3077-L3097) * function[media_upload_tabs()](https://developer.wordpress.org/reference/functions/media_upload_tabs/) * Defines the default media upload tabs. * Used by [1 function](https://developer.wordpress.org/reference/functions/media_upload_tabs/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/media_upload_tabs/#uses) | Source: [wp-admin/includes/media.php:16](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L16-L32) * function[media_upload_text_after()](https://developer.wordpress.org/reference/functions/media_upload_text_after/) * Used to display a “After a file has been uploaded. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_text_after/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/media_upload_text_after/#uses) | Source: [wp-admin/includes/media.php:3070](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L3070-L3070) * function[media_upload_type_form()](https://developer.wordpress.org/reference/functions/media_upload_type_form/) * Outputs the legacy media upload form for a given media type. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_type_form/#used-by) | Uses [14 functions](https://developer.wordpress.org/reference/functions/media_upload_type_form/#uses) | Source: [wp-admin/includes/media.php:2331](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L2331-L2394) * function[media_upload_type_url_form()](https://developer.wordpress.org/reference/functions/media_upload_type_url_form/) * Outputs the legacy media upload form for external media. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_type_url_form/#used-by) | Uses [8 functions](https://developer.wordpress.org/reference/functions/media_upload_type_url_form/#uses) | Source: [wp-admin/includes/media.php:2405](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/media.php#L2405-L2541) * function[media_upload_video()](https://developer.wordpress.org/reference/functions/media_upload_video/) * Handles uploading a video file. * Used by [0 functions](https://developer.wordpress.org/reference/functions/media_upload_video/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/media_upload_video/#uses) | Source: [wp-admin/includes/deprecated.php:914](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/deprecated.php#L914-L917) * function[menu_page_url()](https://developer.wordpress.org/reference/functions/menu_page_url/) * Gets the URL to access a particular menu page based on the slug it was registered with. * Used by [1 function](https://developer.wordpress.org/reference/functions/menu_page_url/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/menu_page_url/#uses) | Source: [wp-admin/includes/plugin.php:1923](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/plugin.php#L1923-L1945) * function[metadata_exists()](https://developer.wordpress.org/reference/functions/metadata_exists/) * Determines if a meta field with the given key exists for the given object ID. * Used by [4 functions](https://developer.wordpress.org/reference/functions/metadata_exists/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/metadata_exists/#uses) | Source: [wp-includes/meta.php:767](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L767-L795) [Previous Page](https://developer.wordpress.org/reference/functions/page/41/?output_format=md) [1](https://developer.wordpress.org/reference/functions/?output_format=md) … [40](https://developer.wordpress.org/reference/functions/page/40/?output_format=md) 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