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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 | 
|---|---|
| 102 |           $user->use_ssl = 1; | 
| 103 |  | 
| 104 |      $errors = new WP_Error(); | 
| 105 |  | 
| 106 |      /* checking that username has been typed */ | 
| 107 |      if ( $user->user_login == '' ) | 
| 108 |           $errors->add( 'user_login', __( '<strong>ERROR</strong>: Please enter a username.' )); | 
| 109 |  | 
| 110 |      /* checking the password has been typed twice */ | 
| 111 |      do_action_ref_array( 'check_passwords', array ( $user->user_login, & $pass1, & $pass2 )); | 
| 112 |  | 
| 113 |      if ( $update ) { | 
| 114 |           if ( empty($pass1) && !empty($pass2) ) | 
| 115 |                $errors->add( 'pass', __( '<strong>ERROR</strong>: You entered your new password only once.' ), array( 'form-field' => 'pass1' ) ); | 
| 116 |           elseif ( !empty($pass1) && empty($pass2) ) | 
| 117 |                $errors->add( 'pass', __( '<strong>ERROR</strong>: You entered your new password only once.' ), array( 'form-field' => 'pass2' ) ); | 
| 118 |      } else { | 
| 119 |           if ( empty($pass1) ) | 
| 120 |                $errors->add( 'pass', __( '<strong>ERROR</strong>: Please enter your password.' ), array( 'form-field' => 'pass1' ) ); |