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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 |
|---|---|
| 193 | * |
| 194 | * @param null|bool $check Whether to allow updating metadata for the given type. |
| 195 | * @param int $object_id Object ID. |
| 196 | * @param string $meta_key Meta key. |
| 197 | * @param mixed $meta_value Meta value. Must be serializable if non-scalar. |
| 198 | * @param mixed $prev_value Optional. If specified, only update existing |
| 199 | * metadata entries with the specified value. |
| 200 | * Otherwise, update all entries. |
| 201 | */ |
| 202 | $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); |
| 203 | if ( null !== $check ) { |
| 204 | return (bool) $check; |
| 205 | } |
| 206 | |
| 207 | // Compare existing value to new value if no prev value given and the key exists only once. |
| 208 | if ( empty( $prev_value ) ) { |
| 209 | $old_value = get_metadata( $meta_type, $object_id, $meta_key ); |
| 210 | if ( count( $old_value ) == 1 ) { |
| 211 | if ( $old_value[0] === $meta_value ) { |