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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 |
---|---|
1205 | * Filters the value of a user field in the 'db' context. |
1206 | * |
1207 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
1208 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
1209 | * |
1210 | * @since 2.9.0 |
1211 | * |
1212 | * @param mixed $value Value of the prefixed user field. |
1213 | */ |
1214 | $value = apply_filters( "pre_user_{$field}", $value ); |
1215 | } |
1216 | } else { |
1217 | // Use display filters by default. |
1218 | if ( $prefixed ) { |
1219 |
|
1220 | /** This filter is documented in wp-includes/post.php */ |
1221 | $value = apply_filters( "{$field}", $value, $user_id, $context ); |
1222 | } else { |
1223 |
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