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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 |
---|---|
41 | global $wpdb; |
42 |
|
43 | $column = sanitize_key($meta_type . '_id'); |
44 |
|
45 | // expected_slashed ($meta_key) |
46 | $meta_key = wp_unslash($meta_key); |
47 | $meta_value = wp_unslash($meta_value); |
48 | $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type ); |
49 |
|
50 | $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); |
51 | if ( null !== $check ) |
52 | return $check; |
53 |
|
54 | if ( $unique && $wpdb->get_var( $wpdb->prepare( |
55 | "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", |
56 | $meta_key, $object_id ) ) ) |
57 | return false; |
58 |
|
59 | $_meta_value = $meta_value; |