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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 |
---|---|
474 | <?php |
475 | /** |
476 | * Filters the default date formats. |
477 | * |
478 | * @since 2.7.0 |
479 | * @since 4.0.0 Added ISO date standard YYYY-MM-DD format. |
480 | * |
481 | * @param string[] $default_date_formats Array of default date formats. |
482 | */ |
483 | $date_formats = array_unique( apply_filters( 'date_formats', array( __( 'F j, Y' ), 'Y-m-d', 'm/d/Y', 'd/m/Y' ) ) ); |
484 |
|
485 | $custom = true; |
486 |
|
487 | foreach ( $date_formats as $format ) { |
488 | echo "\t<label><input type='radio' name='date_format' value='" . esc_attr( $format ) . "'"; |
489 | if ( get_option( 'date_format' ) === $format ) { // checked() uses "==" rather than "===". |
490 | echo " checked='checked'"; |
491 | $custom = false; |
492 | } |