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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 |
|---|---|
| 1234 | } else if ( 'db' == $context ) { |
| 1235 | if ( $prefixed ) { |
| 1236 | $value = apply_filters("pre_{$field}", $value); |
| 1237 | } else { |
| 1238 | $value = apply_filters("pre_user_{$field}", $value); |
| 1239 | } |
| 1240 | } else { |
| 1241 | // Use display filters by default. |
| 1242 | if ( $prefixed ) |
| 1243 | $value = apply_filters($field, $value, $user_id, $context); |
| 1244 | else |
| 1245 | $value = apply_filters("user_{$field}", $value, $user_id, $context); |
| 1246 | } |
| 1247 | |
| 1248 | if ( 'user_url' == $field ) |
| 1249 | $value = esc_url($value); |
| 1250 | |
| 1251 | if ( 'attribute' == $context ) |
| 1252 | $value = esc_attr($value); |