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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 |
|---|---|
| 475 | /** |
| 476 | * Filter the GD image resource before applying changes to the image. |
| 477 | * |
| 478 | * @since 2.9.0 |
| 479 | * @deprecated 3.5.0 Use wp_image_editor_before_change instead. |
| 480 | * |
| 481 | * @param resource $image GD image resource. |
| 482 | * @param array $changes Array of change operations. |
| 483 | */ |
| 484 | $image = apply_filters( 'image_edit_before_change', $image, $changes ); |
| 485 | } |
| 486 | |
| 487 | foreach ( $changes as $operation ) { |
| 488 | switch ( $operation->type ) { |
| 489 | case 'rotate': |
| 490 | if ( $operation->angle != 0 ) { |
| 491 | if ( $image instanceof WP_Image_Editor ) |
| 492 | $image->rotate( $operation->angle ); |
| 493 | else |