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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 |
---|---|
93 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
94 | * object type (comment, post, term, or user). |
95 | * |
96 | * @since 3.1.0 |
97 | * |
98 | * @param int $object_id Object ID. |
99 | * @param string $meta_key Meta key. |
100 | * @param mixed $_meta_value Meta value. |
101 | */ |
102 | do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); |
103 |
|
104 | $result = $wpdb->insert( |
105 | $table, |
106 | array( |
107 | $column => $object_id, |
108 | 'meta_key' => $meta_key, |
109 | 'meta_value' => $meta_value, |
110 | ) |
111 | ); |