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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 |
|---|---|
| 2566 | $url = str_replace( '&', '&', $url ); |
| 2567 | $url = str_replace( "'", ''', $url ); |
| 2568 | } |
| 2569 | |
| 2570 | if ( ! is_array( $protocols ) ) |
| 2571 | $protocols = wp_allowed_protocols(); |
| 2572 | if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) |
| 2573 | return ''; |
| 2574 | |
| 2575 | return apply_filters('clean_url', $url, $original_url, $_context); |
| 2576 | } |
| 2577 | |
| 2578 | /** |
| 2579 | * Performs esc_url() for database usage. |
| 2580 | * |
| 2581 | * @since 2.8.0 |
| 2582 | * @uses esc_url() |
| 2583 | * |
| 2584 | * @param string $url The URL to be cleaned. |