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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 |
---|---|
62 | * |
63 | * @since 3.1.0 |
64 | * |
65 | * @param null|bool $check Whether to allow adding metadata for the given type. |
66 | * @param int $object_id ID of the object metadata is for. |
67 | * @param string $meta_key Metadata key. |
68 | * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. |
69 | * @param bool $unique Whether the specified meta key should be unique for the object. |
70 | */ |
71 | $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); |
72 | if ( null !== $check ) { |
73 | return $check; |
74 | } |
75 |
|
76 | if ( $unique && $wpdb->get_var( |
77 | $wpdb->prepare( |
78 | "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", |
79 | $meta_key, |
80 | $object_id |