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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.
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579 |
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580 | /** |
581 | * Filters the WP_Image_Editor instance before applying changes to the image. |
582 | * |
583 | * @since 3.5.0 |
584 | * |
585 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
586 | * @param array $changes Array of change operations. |
587 | */ |
588 | $image = apply_filters( 'wp_image_editor_before_change', $image, $changes ); |
589 | } elseif ( is_gd_image( $image ) ) { |
590 |
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591 | /** |
592 | * Filters the GD image resource before applying changes to the image. |
593 | * |
594 | * @since 2.9.0 |
595 | * @deprecated 3.5.0 Use {@see 'wp_image_editor_before_change'} instead. |
596 | * |
597 | * @param resource|GdImage $image GD image resource or GdImage instance. |