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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 |
|---|---|
| 2403 | * Enables developers to determine whether a section of CSS should be allowed or discarded. |
| 2404 | * By default, the value will be false if the part contains \ ( & } = or comments. |
| 2405 | * Return true to allow the CSS part to be included in the output. |
| 2406 | * |
| 2407 | * @since 5.5.0 |
| 2408 | * |
| 2409 | * @param bool $allow_css Whether the CSS in the test string is considered safe. |
| 2410 | * @param string $css_test_string The CSS string to test. |
| 2411 | */ |
| 2412 | $allow_css = apply_filters( 'safecss_filter_attr_allow_css', $allow_css, $css_test_string ); |
| 2413 | |
| 2414 | // Only add the CSS part if it passes the regex check. |
| 2415 | if ( $allow_css ) { |
| 2416 | if ( '' !== $css ) { |
| 2417 | $css .= ';'; |
| 2418 | } |
| 2419 | |
| 2420 | $css .= $css_item; |
| 2421 | } |