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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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544 |
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545 | /** |
546 | * Filters the WP_Image_Editor instance before applying changes to the image. |
547 | * |
548 | * @since 3.5.0 |
549 | * |
550 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
551 | * @param array $changes Array of change operations. |
552 | */ |
553 | $image = apply_filters( 'wp_image_editor_before_change', $image, $changes ); |
554 | } elseif ( is_resource( $image ) ) { |
555 |
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556 | /** |
557 | * Filters the GD image resource before applying changes to the image. |
558 | * |
559 | * @since 2.9.0 |
560 | * @deprecated 3.5.0 Use wp_image_editor_before_change instead. |
561 | * |
562 | * @param resource $image GD image resource. |