WP hooks navigation: Home/browse • Actions index • Filters index
To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
---|---|
113 | $column = sanitize_key($meta_type . '_id'); |
114 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
115 |
|
116 | // expected_slashed ($meta_key) |
117 | $meta_key = wp_unslash($meta_key); |
118 | $passed_value = $meta_value; |
119 | $meta_value = wp_unslash($meta_value); |
120 | $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type ); |
121 |
|
122 | $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); |
123 | if ( null !== $check ) |
124 | return (bool) $check; |
125 |
|
126 | // Compare existing value to new value if no prev value given and the key exists only once. |
127 | if ( empty($prev_value) ) { |
128 | $old_value = get_metadata($meta_type, $object_id, $meta_key); |
129 | if ( count($old_value) == 1 ) { |
130 | if ( $old_value[0] === $meta_value ) |
131 | return false; |