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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 |
---|---|
3820 | require_once ABSPATH . WPINC . '/class-wp-image-editor-imagick.php'; |
3821 | /** |
3822 | * Filters the list of image editing library classes. |
3823 | * |
3824 | * @since 3.5.0 |
3825 | * |
3826 | * @param string[] $image_editors Array of available image editor class names. Defaults are |
3827 | * 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'. |
3828 | */ |
3829 | $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) ); |
3830 |
|
3831 | foreach ( $implementations as $implementation ) { |
3832 | if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) { |
3833 | continue; |
3834 | } |
3835 |
|
3836 | if ( isset( $args['mime_type'] ) && |
3837 | ! call_user_func( |
3838 | array( $implementation, 'supports_mime_type' ), |