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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 |
|---|---|
| 184 | |
| 185 | global $wpdb; |
| 186 | |
| 187 | $type_column = esc_sql($meta_type . '_id'); |
| 188 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
| 189 | // expected_slashed ($meta_key) |
| 190 | $meta_key = stripslashes($meta_key); |
| 191 | $meta_value = stripslashes_deep($meta_value); |
| 192 | |
| 193 | $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); |
| 194 | if ( null !== $check ) |
| 195 | return (bool) $check; |
| 196 | |
| 197 | $_meta_value = $meta_value; |
| 198 | $meta_value = maybe_serialize( $meta_value ); |
| 199 | |
| 200 | $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); |
| 201 | |
| 202 | if ( !$delete_all ) |