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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 |
---|---|
2853 |
|
2854 | /** |
2855 | * Filter the list of image editing library classes. |
2856 | * |
2857 | * @since 3.5.0 |
2858 | * |
2859 | * @param array $image_editors List of available image editors. Defaults are |
2860 | * 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'. |
2861 | */ |
2862 | $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) ); |
2863 |
|
2864 | foreach ( $implementations as $implementation ) { |
2865 | if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) |
2866 | continue; |
2867 |
|
2868 | if ( isset( $args['mime_type'] ) && |
2869 | ! call_user_func( |
2870 | array( $implementation, 'supports_mime_type' ), |
2871 | $args['mime_type'] ) ) { |