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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 |
---|---|
2586 |
|
2587 | /** |
2588 | * Filter the list of image editing library classes. |
2589 | * |
2590 | * @since 3.5.0 |
2591 | * |
2592 | * @param array $image_editors List of available image editors. Defaults are |
2593 | * 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'. |
2594 | */ |
2595 | $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) ); |
2596 |
|
2597 | foreach ( $implementations as $implementation ) { |
2598 | if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) |
2599 | continue; |
2600 |
|
2601 | if ( isset( $args['mime_type'] ) && |
2602 | ! call_user_func( |
2603 | array( $implementation, 'supports_mime_type' ), |
2604 | $args['mime_type'] ) ) { |