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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 |
---|---|
221 | <?php |
222 | /** |
223 | * Filter the default date formats. |
224 | * |
225 | * @since 2.7.0 |
226 | * @since 4.0.0 Added ISO date standard YYYY-MM-DD format. |
227 | * |
228 | * @param array $default_date_formats Array of default date formats. |
229 | */ |
230 | $date_formats = array_unique( apply_filters( 'date_formats', array( __( 'F j, Y' ), 'Y-m-d', 'm/d/Y', 'd/m/Y' ) ) ); |
231 |
|
232 | $custom = true; |
233 |
|
234 | foreach ( $date_formats as $format ) { |
235 | echo "\t<label title='" . esc_attr($format) . "'><input type='radio' name='date_format' value='" . esc_attr($format) . "'"; |
236 | if ( get_option('date_format') === $format ) { // checked() uses "==" rather than "===" |
237 | echo " checked='checked'"; |
238 | $custom = false; |
239 | } |