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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.
This hook occurs 2 times in this file.
Line | Code |
---|---|
2084 | * Filters the result when generating a unique file name. |
2085 | * |
2086 | * @since 4.5.0 |
2087 | * |
2088 | * @param string $filename Unique file name. |
2089 | * @param string $ext File extension, eg. ".png". |
2090 | * @param string $dir Directory path. |
2091 | * @param callable|null $unique_filename_callback Callback function that generates the unique file name. |
2092 | */ |
2093 | return apply_filters( 'wp_unique_filename', $filename2, $ext, $dir, $unique_filename_callback ); |
2094 | } |
2095 |
|
2096 | while ( file_exists( $dir . "/$filename" ) ) { |
2097 | if ( '' == "$number$ext" ) { |
2098 | $filename = "$filename-" . ++$number; |
2099 | } else { |
2100 | $filename = str_replace( array( "-$number$ext", "$number$ext" ), "-" . ++$number . $ext, $filename ); |
2101 | } |
2102 | } |
2103 | } |
2104 |
|
2105 | /** This filter is documented in wp-includes/functions.php */ |
2106 | return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback ); |
2107 | } |
2108 |
|
2109 | /** |
2110 | * Create a file in the upload folder with given content. |
2111 | * |
2112 | * If there is an error, then the key 'error' will exist with the error message. |
2113 | * If success, then the key 'file' will have the unique file path, the 'url' key |
2114 | * will have the link to the new file. and the 'error' key will be set to false. |
2115 | * |