有报错: syntax error, '[' in D:\xampp\htdocs\DVWA\vulnerabilities\sqli\index.php on line 65

if( $vulnerabilityFile == 'medium.php' ) {
$page[ 'body' ] .= "\n <select name=\"id\">";
$query = "SELECT COUNT(*) FROM users;";
$result = mysqli_query($GLOBALS["___mysqli_ston"], $query ) or die( '<pre>' . ((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_error($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_error()) ? $___mysqli_res : false)) . '</pre>' );
$num = mysqli_fetch_row( $result )[0];
$i = 0;
while( $i < $num ) { $i++; $page[ 'body' ] .= "<option value=\"{$i}\">{$i}</option>"; }
$page[ 'body' ] .= "</select>";

相关了解……