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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 |
|---|---|
| 71 | * |
| 72 | * @since 3.1.0 |
| 73 | * |
| 74 | * @param null|bool $check Whether to allow adding metadata for the given type. |
| 75 | * @param int $object_id ID of the object metadata is for. |
| 76 | * @param string $meta_key Metadata key. |
| 77 | * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. |
| 78 | * @param bool $unique Whether the specified meta key should be unique for the object. |
| 79 | */ |
| 80 | $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); |
| 81 | if ( null !== $check ) { |
| 82 | return $check; |
| 83 | } |
| 84 | |
| 85 | if ( $unique && $wpdb->get_var( |
| 86 | $wpdb->prepare( |
| 87 | "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", |
| 88 | $meta_key, |
| 89 | $object_id |