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PHP调用linux命令详细说明

May 25, 2016 pm 04:42 PM
linux command php call

在php中调用linux命令的函数是

string exec(string command,string[array],int[return_var]); 

如:exec( "vpopmail ");echo exec('whoami');


再看一实例,代码如下:

function exec_enabled() { 
    $disabled = explode(', ', ini_get('disable_functions')); 
    return !in_array('exec', $disabled); 
}
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<?php  
$tmp = exec("c:Imagegm.exe convert c:Imagefile1.tiff c:Imagefile1.jpg", $results);  
?>
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还有一种命令是:php通过函数system()调用系统命令.

string system ( string $command [, int &$return_var ] )

实例:system('asterisk -vvvvvvvvvvvc');

system()是一样的函数C的,它执行给定的命令和输出结果的版本,该system()的调用也尝试自动刷新网页服务器的输出缓冲器在每个输出行如果PHP运行作为服务器模块,如果你需要执行一个命令,并已全部通过直接从背面没有任何干扰的命令数据,使用passthru()函数.

$last_line = system(&#39;ls&#39;, $retval); 
function my_exec($cmd, $input=&#39;&#39;)  
{
    $proc=proc_open($cmd, array(0=>array(&#39;pipe&#39;, &#39;r&#39;), 1=>array(&#39;pipe&#39;, &#39;w&#39;), 2=>array(&#39;pipe&#39;, &#39;w&#39;)), $pipes);  
    fwrite($pipes[0], $input);fclose($pipes[0]);  
    $stdout=stream_get_contents($pipes[1]);fclose($pipes[1]);  
    $stderr=stream_get_contents($pipes[2]);fclose($pipes[2]);  
    $rtn=proc_close($proc);  
    return array(&#39;stdout&#39;=>$stdout,  
           &#39;stderr&#39;=>$stderr,  
           &#39;return&#39;=>$rtn  
    );  
}
var_export(my_exec(&#39;echo -e $(</dev/stdin) | wc -l&#39;, &#39;hnelnlo&#39;));
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实例三,代码如下:

<?php
$cmd = "date"; 
$output = system($cmd);  
printf("System Output: $output "); 
exec($cmd, $results);  
printf("Exec Output: {$results[0]} ");
?>
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php调用linux命令的权限问题

你可以使用定时任务执行你要调用的php,这时的权限就是root,php通过函数system()调用系统命令.

php一般是以apache用户身份去执行的,把apache加入到存储你文件的父文件夹属组里去,然后改该父文件夹权限为775,这样属组成员就有写的权限,而apache属于这个组就可以改写该目录下所有文件的权限,当然,属组最好不要是root,你可以为该文件夹改个其它普通用户组.

改apache/php的运行用户方法不安全.


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