linux下php执行 外部的shell脚本system返回126

<code><?php $command = '/var/www/html/fzip.out  /var/www/html/test  /var/www/html/test.fzip';
//$command = 'ls /var/www/html';
system($command,$return);
exec($command,$out);
//echo $command;
print_r($return);
echo '<br>=================<br>';
print_r($out);?></code>

<code><?php $command = '/var/www/html/fzip.out  /var/www/html/test  /var/www/html/test.fzip';
//$command = 'ls /var/www/html';
system($command,$return);
exec($command,$out);
//echo $command;
print_r($return);
echo '<br>=================<br>';
print_r($out);?></code>