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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 |
|---|---|
| 567 | |
| 568 | /** |
| 569 | * Filters the WP_Image_Editor instance before applying changes to the image. |
| 570 | * |
| 571 | * @since 3.5.0 |
| 572 | * |
| 573 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
| 574 | * @param array $changes Array of change operations. |
| 575 | */ |
| 576 | $image = apply_filters( 'wp_image_editor_before_change', $image, $changes ); |
| 577 | } elseif ( is_gd_image( $image ) ) { |
| 578 | |
| 579 | /** |
| 580 | * Filters the GD image resource before applying changes to the image. |
| 581 | * |
| 582 | * @since 2.9.0 |
| 583 | * @deprecated 3.5.0 Use {@see 'wp_image_editor_before_change'} instead. |
| 584 | * |
| 585 | * @param resource|GdImage $image GD image resource or GdImage instance. |