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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 |
|---|---|
| 61 | * @since 3.1.0 |
| 62 | * |
| 63 | * @param null|bool $check Whether to allow adding metadata for the given type. |
| 64 | * @param int $object_id Object ID. |
| 65 | * @param string $meta_key Meta key. |
| 66 | * @param mixed $meta_value Meta value. Must be serializable if non-scalar. |
| 67 | * @param bool $unique Whether the specified meta key should be unique |
| 68 | * for the object. Optional. Default false. |
| 69 | */ |
| 70 | $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); |
| 71 | if ( null !== $check ) |
| 72 | return $check; |
| 73 | |
| 74 | if ( $unique && $wpdb->get_var( $wpdb->prepare( |
| 75 | "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", |
| 76 | $meta_key, $object_id ) ) ) |
| 77 | return false; |
| 78 | |
| 79 | $_meta_value = $meta_value; |