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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 |
|---|---|
| 487 | |
| 488 | /** |
| 489 | * Filter the WP_Image_Editor instance before applying changes to the image. |
| 490 | * |
| 491 | * @since 3.5.0 |
| 492 | * |
| 493 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
| 494 | * @param array $changes Array of change operations. |
| 495 | */ |
| 496 | $image = apply_filters( 'wp_image_editor_before_change', $image, $changes ); |
| 497 | } elseif ( is_resource( $image ) ) { |
| 498 | |
| 499 | /** |
| 500 | * Filter the GD image resource before applying changes to the image. |
| 501 | * |
| 502 | * @since 2.9.0 |
| 503 | * @deprecated 3.5.0 Use wp_image_editor_before_change instead. |
| 504 | * |
| 505 | * @param resource $image GD image resource. |