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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. |