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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 |
|---|---|
| 2889 | |
| 2890 | /** |
| 2891 | * Filter the list of image editing library classes. |
| 2892 | * |
| 2893 | * @since 3.5.0 |
| 2894 | * |
| 2895 | * @param array $image_editors List of available image editors. Defaults are |
| 2896 | * 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'. |
| 2897 | */ |
| 2898 | $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) ); |
| 2899 | |
| 2900 | foreach ( $implementations as $implementation ) { |
| 2901 | if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) |
| 2902 | continue; |
| 2903 | |
| 2904 | if ( isset( $args['mime_type'] ) && |
| 2905 | ! call_user_func( |
| 2906 | array( $implementation, 'supports_mime_type' ), |
| 2907 | $args['mime_type'] ) ) { |