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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 |
|---|---|
| 5505 | * |
| 5506 | * The string returned here consists of a space or carriage return-delimited list |
| 5507 | * of trackback URLs. |
| 5508 | * |
| 5509 | * @since 3.4.0 |
| 5510 | * |
| 5511 | * @param string $urls_to_ping Sanitized space or carriage return separated URLs. |
| 5512 | * @param string $to_ping Space or carriage return separated URLs before sanitization. |
| 5513 | */ |
| 5514 | return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping ); |
| 5515 | } |
| 5516 | |
| 5517 | /** |
| 5518 | * Adds slashes to a string or recursively adds slashes to strings within an array. |
| 5519 | * |
| 5520 | * This should be used when preparing data for core API that expects slashed data. |
| 5521 | * This should not be used to escape data going directly into an SQL query. |
| 5522 | * |
| 5523 | * @since 3.6.0 |