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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 | 
|---|---|
| 560 |                                     * Filters a user contactmethod label. | 
| 561 |                                     * | 
| 562 |                                     * The dynamic portion of the hook name, `$name`, refers to | 
| 563 |                                     * each of the keys in the contact methods array. | 
| 564 |                                     * | 
| 565 |                                     * @since 2.9.0 | 
| 566 |                                     * | 
| 567 |                                     * @param string $desc The translatable label for the contact method. | 
| 568 |                                     */ | 
| 569 |                                    echo apply_filters( "user_{$name}_label", $desc ); | 
| 570 |                                    ?> | 
| 571 |                                    </label> | 
| 572 |                               </th> | 
| 573 |                               <td> | 
| 574 |                                    <input type="text" name="<?php echo $name; ?>" id="<?php echo $name; ?>" value="<?php echo esc_attr( $profile_user->$name ); ?>" class="regular-text" /> | 
| 575 |                               </td> | 
| 576 |                          </tr> | 
| 577 |                          <?php endforeach; ?> | 
| 578 |                     </table> |