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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 |
|---|---|
| 2221 | * |
| 2222 | * @since 2.0.4 |
| 2223 | * |
| 2224 | * @param string $filename File name or path. |
| 2225 | * @param array $mimes Optional. Key is the file extension with value as the mime type. |
| 2226 | * @return array Values with extension first and mime type. |
| 2227 | */ |
| 2228 | function wp_check_filetype( $filename, $mimes = null ) { |
| 2229 | // Accepted MIME types are set here as PCRE unless provided. |
| 2230 | $mimes = ( is_array( $mimes ) ) ? $mimes : apply_filters( 'upload_mimes', array( |
| 2231 | 'jpg|jpeg|jpe' => 'image/jpeg', |
| 2232 | 'gif' => 'image/gif', |
| 2233 | 'png' => 'image/png', |
| 2234 | 'bmp' => 'image/bmp', |
| 2235 | 'tif|tiff' => 'image/tiff', |
| 2236 | 'ico' => 'image/x-icon', |
| 2237 | 'asf|asx|wax|wmv|wmx' => 'video/asf', |
| 2238 | 'avi' => 'video/avi', |
| 2239 | 'divx' => 'video/divx', |