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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 |
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457 |
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458 | /** |
459 | * Filter the WP_Image_Editor instance before applying changes to the image. |
460 | * |
461 | * @since 3.5.0 |
462 | * |
463 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
464 | * @param array $changes Array of change operations. |
465 | */ |
466 | $image = apply_filters( 'wp_image_editor_before_change', $image, $changes ); |
467 | } elseif ( is_resource( $image ) ) { |
468 |
|
469 | /** |
470 | * Filter the GD image resource before applying changes to the image. |
471 | * |
472 | * @since 2.9.0 |
473 | * @deprecated 3.5.0 Use wp_image_editor_before_change instead. |
474 | * |
475 | * @param resource $image GD image resource. |