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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 |
|---|---|
| 3080 | * |
| 3081 | * This filter should be used to add, not remove, mime types. To remove |
| 3082 | * mime types, use the {@see 'upload_mimes'} filter. |
| 3083 | * |
| 3084 | * @since 3.5.0 |
| 3085 | * |
| 3086 | * @param string[] $wp_get_mime_types Mime types keyed by the file extension regex |
| 3087 | * corresponding to those types. |
| 3088 | */ |
| 3089 | return apply_filters( |
| 3090 | 'mime_types', |
| 3091 | array( |
| 3092 | // Image formats. |
| 3093 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 3094 | 'gif' => 'image/gif', |
| 3095 | 'png' => 'image/png', |
| 3096 | 'bmp' => 'image/bmp', |
| 3097 | 'tiff|tif' => 'image/tiff', |
| 3098 | 'ico' => 'image/x-icon', |