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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2551 | * @since 2.8.6 |
| 2552 | * |
| 2553 | * @return array Array of mime types keyed by the file extension regex corresponding to those types. |
| 2554 | */ |
| 2555 | function get_allowed_mime_types() { |
| 2556 | static $mimes = false; |
| 2557 | |
| 2558 | if ( !$mimes ) { |
| 2559 | // Accepted MIME types are set here as PCRE unless provided. |
| 2560 | $mimes = apply_filters( 'upload_mimes', array( |
| 2561 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 2562 | 'gif' => 'image/gif', |
| 2563 | 'png' => 'image/png', |
| 2564 | 'bmp' => 'image/bmp', |
| 2565 | 'tif|tiff' => 'image/tiff', |
| 2566 | 'ico' => 'image/x-icon', |
| 2567 | 'asf|asx|wax|wmv|wmx' => 'video/asf', |
| 2568 | 'avi' => 'video/avi', |
| 2569 | 'divx' => 'video/divx', |