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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 |
---|---|
528 | /** |
529 | * Filter the GD image resource before applying changes to the image. |
530 | * |
531 | * @since 2.9.0 |
532 | * @deprecated 3.5.0 Use wp_image_editor_before_change instead. |
533 | * |
534 | * @param resource $image GD image resource. |
535 | * @param array $changes Array of change operations. |
536 | */ |
537 | $image = apply_filters( 'image_edit_before_change', $image, $changes ); |
538 | } |
539 |
|
540 | foreach ( $changes as $operation ) { |
541 | switch ( $operation->type ) { |
542 | case 'rotate': |
543 | if ( $operation->angle != 0 ) { |
544 | if ( $image instanceof WP_Image_Editor ) |
545 | $image->rotate( $operation->angle ); |
546 | else |