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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 |
---|---|
85 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
86 | * object type (comment, post, or user). |
87 | * |
88 | * @since 3.1.0 |
89 | * |
90 | * @param int $object_id Object ID. |
91 | * @param string $meta_key Meta key. |
92 | * @param mixed $meta_value Meta value. |
93 | */ |
94 | do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); |
95 |
|
96 | $result = $wpdb->insert( $table, array( |
97 | $column => $object_id, |
98 | 'meta_key' => $meta_key, |
99 | 'meta_value' => $meta_value |
100 | ) ); |
101 |
|
102 | if ( ! $result ) |
103 | return false; |