在php返回垃圾(HTTP响应)中执行exec(‘php -v’)时出错

我有一个共享服务器Linux,我面临一个奇怪的问题.我试图通过PHP执行以下命令,它运行正常;给我返回PHP安装路径/usr/bin/php.

exec('which php');// This runs so exec is not disabled

但是我尝试用exec执行的任何命令(‘php …’);没有随机返回一个98到114个元素的数组,几乎全部都是垃圾.我跑的命令的例子是……

exec('php -v');
exec('php -i');
exec('/usr/bin/php -v');

以上都没有返回合理的东西.知道为什么php运行的任何命令没有执行？

下面是exec()返回给我的数据数组的var_dump().

编辑(更多RND之后)

我能够执行

exec('php -h')

它以可读格式重新表达了以下数组.

string(9) "php -help"
string(47) "Usage: php [-q] [-h] [-s] [-v] [-i] [-f ]"
string(27) "       php  [args...]"
string(36) "  -a               Run interactively"
string(69) "  -b | Bind Path for external FASTCGI Server mode"
string(57) "  -C               Do not chdir to the script's directory"
string(58) "  -c | Look for php.ini file in this directory"
string(47) "  -n               No php.ini file will be used"
string(56) "  -d foo[=bar]     Define INI entry foo with value 'bar'"
string(70) "  -e               Generate extended information for debugger/profiler"
string(46) "  -f         Parse .  Implies `-q'"
string(28) "  -h               This help"
string(34) "  -i               PHP information"
string(43) "  -l               Syntax check only (lint)"
string(43) "  -m               Show compiled in modules"
string(60) "  -q               Quiet-mode.  Suppress HTTP Header output."
string(60) "  -s               Display colour syntax highlighted source."
string(33) "  -v               Version number"
string(72) "  -w               Display source with stripped comments and whitespace."
string(46) "  -z         Load Zend extension ."
string(75) "  -T        Measure execution time of script repeated  times."
This page was created in 0.055487155914307 seconds

哦,顺便说一下我用来测试的脚本是以下……

<?php
$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$starttime = $mtime; 


if(!empty($_GET['p']) && $_GET['p'] == true){

    //$command = 'php -help'; //this works
    //$command = 'cat ' . getcwd() . '/dummy1.txt'; //this works echo's a simple text file

    //$command = 'php -q ' . getcwd() . '/dummy1.txt'; //NOT WORKING
    $command = 'php -m'; //NOT WORKING

    echo '<div><pre>';
    var_dump($command);
    echo '</pre></div>';

    exec($command, $output, $return);
    //passthru($command,$output);

    echo '<div><pre>';
    foreach($output as $key => $value){
        var_dump($output[$key]);
    }   
    echo '</pre></div>';
}


$mtime = microtime(); 
$mtime = explode(" ",$mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$endtime = $mtime; 
$totaltime = ($endtime - $starttime); 
echo "This page was created in ".$totaltime." seconds";
?>

Pastebin.org Link

解决方法:

它的PHP CGI从环境中读取脚本名称,从而导致调用脚本运行多次或有时无限次.

解决方案是使用命令php-cli而不是命令php.

替换行$command =’php -m’; with $command =’php-cli -m’;在你的代码上,一切都会正常工作.

标签：php,linux,exec,shared-hosting
来源： https://codeday.me/bug/20190613/1230128.html