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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 |
|---|---|
| 1029 | if ( !is_string($value) && !is_numeric($value) ) |
| 1030 | return $value; |
| 1031 | |
| 1032 | $prefixed = false !== strpos( $field, 'user_' ); |
| 1033 | |
| 1034 | if ( 'edit' == $context ) { |
| 1035 | if ( $prefixed ) { |
| 1036 | |
| 1037 | /** This filter is documented in wp-includes/post.php */ |
| 1038 | $value = apply_filters( "edit_{$field}", $value, $user_id ); |
| 1039 | } else { |
| 1040 | |
| 1041 | /** |
| 1042 | * Filter a user field value in the 'edit' context. |
| 1043 | * |
| 1044 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1045 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1046 | * |
| 1047 | * @since 2.9.0 |