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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 |
---|---|
2676 | } |
2677 | } |
2678 |
|
2679 | /* |
2680 | * Check if an image will be converted after uploading or some existing image sub-size file names may conflict |
2681 | * when regenerated. If yes, ensure the new file name will be unique and will produce unique sub-sizes. |
2682 | */ |
2683 | if ( $is_image ) { |
2684 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
2685 | $output_formats = apply_filters( 'image_editor_output_format', array(), $_dir . $filename, $mime_type ); |
2686 | $alt_types = array(); |
2687 |
|
2688 | if ( ! empty( $output_formats[ $mime_type ] ) ) { |
2689 | // The image will be converted to this format/mime type. |
2690 | $alt_mime_type = $output_formats[ $mime_type ]; |
2691 |
|
2692 | // Other types of images whose names may conflict if their sub-sizes are regenerated. |
2693 | $alt_types = array_keys( array_intersect( $output_formats, array( $mime_type, $alt_mime_type ) ) ); |
2694 | $alt_types[] = $alt_mime_type; |