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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 |
|---|---|
| 2114 | /** |
| 2115 | * Filters a sanitized username string. |
| 2116 | * |
| 2117 | * @since 2.0.1 |
| 2118 | * |
| 2119 | * @param string $username Sanitized username. |
| 2120 | * @param string $raw_username The username prior to sanitization. |
| 2121 | * @param bool $strict Whether to limit the sanitization to specific characters. |
| 2122 | */ |
| 2123 | return apply_filters( 'sanitize_user', $username, $raw_username, $strict ); |
| 2124 | } |
| 2125 | |
| 2126 | /** |
| 2127 | * Sanitizes a string key. |
| 2128 | * |
| 2129 | * Keys are used as internal identifiers. Lowercase alphanumeric characters, |
| 2130 | * dashes, and underscores are allowed. |
| 2131 | * |
| 2132 | * @since 3.0.0 |