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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 |
|---|---|
| 3227 | require_once ABSPATH . WPINC . '/class-wp-image-editor-imagick.php'; |
| 3228 | /** |
| 3229 | * Filters the list of image editing library classes. |
| 3230 | * |
| 3231 | * @since 3.5.0 |
| 3232 | * |
| 3233 | * @param array $image_editors List of available image editors. Defaults are |
| 3234 | * 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'. |
| 3235 | */ |
| 3236 | $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) ); |
| 3237 | |
| 3238 | foreach ( $implementations as $implementation ) { |
| 3239 | if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) { |
| 3240 | continue; |
| 3241 | } |
| 3242 | |
| 3243 | if ( isset( $args['mime_type'] ) && |
| 3244 | ! call_user_func( |
| 3245 | array( $implementation, 'supports_mime_type' ), |