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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 | 
|---|---|
| 446 | <table class="form-table"> | 
| 447 | <tr> | 
| 448 |      <th><label for="description"><?php _e('Biographical Info'); ?></label></th> | 
| 449 |      <td><textarea name="description" id="description" rows="5" cols="30"><?php echo $profileuser->description; // textarea_escaped ?></textarea><br /> | 
| 450 |      <span class="description"><?php _e('Share a little biographical information to fill out your profile. This may be shown publicly.'); ?></span></td> | 
| 451 | </tr> | 
| 452 |  | 
| 453 | <?php | 
| 454 | /** This filter is documented in wp-admin/user-new.php */ | 
| 455 | $show_password_fields = apply_filters( 'show_password_fields', true, $profileuser ); | 
| 456 | if ( $show_password_fields ) : | 
| 457 | ?> | 
| 458 | <tr id="password"> | 
| 459 |      <th><label for="pass1"><?php _e( 'New Password' ); ?></label></th> | 
| 460 |      <td> | 
| 461 |           <input class="hidden" value=" " /><!-- #24364 workaround --> | 
| 462 |           <input type="password" name="pass1" id="pass1" class="regular-text" size="16" value="" autocomplete="off" /><br /> | 
| 463 |           <span class="description"><?php _e( 'If you would like to change the password type a new one. Otherwise leave this blank.' ); ?></span> | 
| 464 |      </td> |