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 |
---|---|
69 | * |
70 | * @since 3.1.0 |
71 | * |
72 | * @param null|bool $check Whether to allow adding metadata for the given type. |
73 | * @param int $object_id ID of the object metadata is for. |
74 | * @param string $meta_key Metadata key. |
75 | * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. |
76 | * @param bool $unique Whether the specified meta key should be unique for the object. |
77 | */ |
78 | $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); |
79 | if ( null !== $check ) { |
80 | return $check; |
81 | } |
82 |
|
83 | if ( $unique && $wpdb->get_var( |
84 | $wpdb->prepare( |
85 | "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", |
86 | $meta_key, |
87 | $object_id |