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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 |
|---|---|
| 108 | global $wpdb; |
| 109 | |
| 110 | $column = esc_sql($meta_type . '_id'); |
| 111 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
| 112 | |
| 113 | // expected_slashed ($meta_key) |
| 114 | $meta_key = stripslashes($meta_key); |
| 115 | $meta_value = stripslashes_deep($meta_value); |
| 116 | |
| 117 | $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); |
| 118 | if ( null !== $check ) |
| 119 | return (bool) $check; |
| 120 | |
| 121 | if ( ! $meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ) ) |
| 122 | return add_metadata($meta_type, $object_id, $meta_key, $meta_value); |
| 123 | |
| 124 | // Compare existing value to new value if no prev value given and the key exists only once. |
| 125 | if ( empty($prev_value) ) { |
| 126 | $old_value = get_metadata($meta_type, $object_id, $meta_key); |