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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 |
|---|---|
| 3447 | /** |
| 3448 | * Filter a string cleaned and escaped for output as a URL. |
| 3449 | * |
| 3450 | * @since 2.3.0 |
| 3451 | * |
| 3452 | * @param string $good_protocol_url The cleaned URL to be returned. |
| 3453 | * @param string $original_url The URL prior to cleaning. |
| 3454 | * @param string $_context If 'display', replace ampersands and single quotes only. |
| 3455 | */ |
| 3456 | return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context ); |
| 3457 | } |
| 3458 | |
| 3459 | /** |
| 3460 | * Performs esc_url() for database usage. |
| 3461 | * |
| 3462 | * @since 2.8.0 |
| 3463 | * |
| 3464 | * @param string $url The URL to be cleaned. |
| 3465 | * @param array $protocols An array of acceptable protocols. |