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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 |
|---|---|
| 2147 | /** |
| 2148 | * Filters a sanitized username string. |
| 2149 | * |
| 2150 | * @since 2.0.1 |
| 2151 | * |
| 2152 | * @param string $username Sanitized username. |
| 2153 | * @param string $raw_username The username prior to sanitization. |
| 2154 | * @param bool $strict Whether to limit the sanitization to specific characters. |
| 2155 | */ |
| 2156 | return apply_filters( 'sanitize_user', $username, $raw_username, $strict ); |
| 2157 | } |
| 2158 | |
| 2159 | /** |
| 2160 | * Sanitizes a string key. |
| 2161 | * |
| 2162 | * Keys are used as internal identifiers. Lowercase alphanumeric characters, |
| 2163 | * dashes, and underscores are allowed. |
| 2164 | * |
| 2165 | * @since 3.0.0 |