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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 |
|---|---|
| 515 | |
| 516 | /** |
| 517 | * Filters the WP_Image_Editor instance before applying changes to the image. |
| 518 | * |
| 519 | * @since 3.5.0 |
| 520 | * |
| 521 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
| 522 | * @param array $changes Array of change operations. |
| 523 | */ |
| 524 | $image = apply_filters( 'wp_image_editor_before_change', $image, $changes ); |
| 525 | } elseif ( is_resource( $image ) ) { |
| 526 | |
| 527 | /** |
| 528 | * Filters the GD image resource before applying changes to the image. |
| 529 | * |
| 530 | * @since 2.9.0 |
| 531 | * @deprecated 3.5.0 Use wp_image_editor_before_change instead. |
| 532 | * |
| 533 | * @param resource $image GD image resource. |