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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 |
|---|---|
| 339 | <?php |
| 340 | /** |
| 341 | * Filters the default date formats. |
| 342 | * |
| 343 | * @since 2.7.0 |
| 344 | * @since 4.0.0 Added ISO date standard YYYY-MM-DD format. |
| 345 | * |
| 346 | * @param string[] $default_date_formats Array of default date formats. |
| 347 | */ |
| 348 | $date_formats = array_unique( apply_filters( 'date_formats', array( __( 'F j, Y' ), 'Y-m-d', 'm/d/Y', 'd/m/Y' ) ) ); |
| 349 | |
| 350 | $custom = true; |
| 351 | |
| 352 | foreach ( $date_formats as $format ) { |
| 353 | echo "\t<label><input type='radio' name='date_format' value='" . esc_attr( $format ) . "'"; |
| 354 | if ( get_option( 'date_format' ) === $format ) { // checked() uses "==" rather than "===". |
| 355 | echo " checked='checked'"; |
| 356 | $custom = false; |
| 357 | } |