php中执行系统命令的方法_PHP

在php中执行系统命令，如LS

<?php // exec.php
$cmd = "dir"; // Windows
// $cmd = "ls"; // Linux, Unix & Mac
exec(escapeshellcmd($cmd), $output, $status);
if ($status) echo "Exec command failed";
else
{
echo "";
foreach($output as $line) echo "$linen";
}
?>