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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 |
|---|---|
| 712 | } else if ( 'db' == $context ) { |
| 713 | if ( $prefixed ) { |
| 714 | $value = apply_filters("pre_$field", $value); |
| 715 | } else { |
| 716 | $value = apply_filters("pre_user_$field", $value); |
| 717 | } |
| 718 | } else { |
| 719 | // Use display filters by default. |
| 720 | if ( $prefixed ) |
| 721 | $value = apply_filters($field, $value, $user_id, $context); |
| 722 | else |
| 723 | $value = apply_filters("user_$field", $value, $user_id, $context); |
| 724 | } |
| 725 | |
| 726 | if ( 'user_url' == $field ) |
| 727 | $value = esc_url($value); |
| 728 | |
| 729 | if ( 'attribute' == $context ) |
| 730 | $value = esc_attr($value); |