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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 |
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224 | * |
225 | * @param null|bool $check Whether to allow updating metadata for the given type. |
226 | * @param int $object_id ID of the object metadata is for. |
227 | * @param string $meta_key Metadata key. |
228 | * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. |
229 | * @param mixed $prev_value Optional. Previous value to check before updating. |
230 | * If specified, only update existing metadata entries with |
231 | * this value. Otherwise, update all entries. |
232 | */ |
233 | $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); |
234 | if ( null !== $check ) { |
235 | return (bool) $check; |
236 | } |
237 |
|
238 | // Compare existing value to new value if no prev value given and the key exists only once. |
239 | if ( empty( $prev_value ) ) { |
240 | $old_value = get_metadata_raw( $meta_type, $object_id, $meta_key ); |
241 | if ( is_countable( $old_value ) && count( $old_value ) === 1 ) { |
242 | if ( $old_value[0] === $meta_value ) { |