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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 |
|---|---|
| 1855 | * @since 4.3.0 |
| 1856 | * |
| 1857 | * @see wp_insert_user() For `$user` and `$userdata` fields. |
| 1858 | * |
| 1859 | * @param bool $send Whether to send the email. |
| 1860 | * @param array $user The original user array. |
| 1861 | * @param array $userdata The updated user array. |
| 1862 | * |
| 1863 | */ |
| 1864 | $send_email_change_email = apply_filters( 'send_email_change_email', true, $user, $userdata ); |
| 1865 | } |
| 1866 | |
| 1867 | wp_cache_delete( $user['user_email'], 'useremail' ); |
| 1868 | wp_cache_delete( $user['user_nicename'], 'userslugs' ); |
| 1869 | |
| 1870 | // Merge old and new fields with new fields overwriting old ones. |
| 1871 | $userdata = array_merge( $user, $userdata ); |
| 1872 | $user_id = wp_insert_user( $userdata ); |
| 1873 | |