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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 |
|---|---|
| 2140 | * @since 3.0.0 |
| 2141 | * |
| 2142 | * @param array $wp_check_filetype_and_ext File data array containing 'ext', 'type', and |
| 2143 | * 'proper_filename' keys. |
| 2144 | * @param string $file Full path to the file. |
| 2145 | * @param string $filename The name of the file (may differ from $file due to |
| 2146 | * $file being in a tmp directory). |
| 2147 | * @param array $mimes Key is the file extension with value as the mime type. |
| 2148 | */ |
| 2149 | return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes ); |
| 2150 | } |
| 2151 | |
| 2152 | /** |
| 2153 | * Retrieve list of mime types and file extensions. |
| 2154 | * |
| 2155 | * @since 3.5.0 |
| 2156 | * |
| 2157 | * @return array Array of mime types keyed by the file extension regex corresponding to those types. |
| 2158 | */ |