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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 |
|---|---|
| 38 | $user_login = sanitize_user($user_login, true); |
| 39 | $user_login = apply_filters('pre_user_login', $user_login); |
| 40 | |
| 41 | if ( empty($user_nicename) ) |
| 42 | $user_nicename = sanitize_title( $user_login ); |
| 43 | $user_nicename = apply_filters('pre_user_nicename', $user_nicename); |
| 44 | |
| 45 | if ( empty($user_url) ) |
| 46 | $user_url = ''; |
| 47 | $user_url = apply_filters('pre_user_url', $user_url); |
| 48 | |
| 49 | if ( empty($user_email) ) |
| 50 | $user_email = ''; |
| 51 | $user_email = apply_filters('pre_user_email', $user_email); |
| 52 | |
| 53 | if ( empty($display_name) ) |
| 54 | $display_name = $user_login; |
| 55 | $display_name = apply_filters('pre_user_display_name', $display_name); |
| 56 | |