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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 |
|---|---|
| 2448 | * @since 2.8.6 |
| 2449 | * |
| 2450 | * @return array Array of mime types keyed by the file extension regex corresponding to those types. |
| 2451 | */ |
| 2452 | function get_allowed_mime_types() { |
| 2453 | static $mimes = false; |
| 2454 | |
| 2455 | if ( !$mimes ) { |
| 2456 | // Accepted MIME types are set here as PCRE unless provided. |
| 2457 | $mimes = apply_filters( 'upload_mimes', array( |
| 2458 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 2459 | 'gif' => 'image/gif', |
| 2460 | 'png' => 'image/png', |
| 2461 | 'bmp' => 'image/bmp', |
| 2462 | 'tif|tiff' => 'image/tiff', |
| 2463 | 'ico' => 'image/x-icon', |
| 2464 | 'asf|asx|wax|wmv|wmx' => 'video/asf', |
| 2465 | 'avi' => 'video/avi', |
| 2466 | 'divx' => 'video/divx', |