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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 |
|---|---|
| 1138 | /** |
| 1139 | * Filter a sanitized username string. |
| 1140 | * |
| 1141 | * @since 2.0.1 |
| 1142 | * |
| 1143 | * @param string $username Sanitized username. |
| 1144 | * @param string $raw_username The username prior to sanitization. |
| 1145 | * @param bool $strict Whether to limit the sanitization to specific characters. Default false. |
| 1146 | */ |
| 1147 | return apply_filters( 'sanitize_user', $username, $raw_username, $strict ); |
| 1148 | } |
| 1149 | |
| 1150 | /** |
| 1151 | * Sanitizes a string key. |
| 1152 | * |
| 1153 | * Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed. |
| 1154 | * |
| 1155 | * @since 3.0.0 |
| 1156 | * |