PHP 8.3.0 RC 6 available for testing

执行运算符

PHP 支持一个执行运算符:反引号(``)。注意这不是单引号!PHP 将尝试将反引号中的内容作为 shell 命令来执行,并将其输出信息返回(即,可以赋给一个变量而不是简单地丢弃到标准输出)。使用反引号运算符“`”的效果与函数 shell_exec() 相同。

<?php
$output
= `ls -al`;
echo
"<pre>$output</pre>";
?>

注意:

关闭了 shell_exec() 时反引号运算符是无效的。

注意:

与其它某些语言不同,反引号不能在双引号字符串中使用。

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User Contributed Notes 3 notes

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140
robert
17 years ago
Just a general usage note. I had a very difficult time solving a problem with my script, when I accidentally put one of these backticks at the beginning of a line, like so:

[lots of code]
` $URL = "blah...";
[more code]

Since the backtick is right above the tab key, I probably just fat-fingered it while indenting the code.

What made this so hard to find, was that PHP reported a parse error about 50 or so lines *below* the line containing the backtick. (There were no other backticks anywhere in my code.) And the error message was rather cryptic:

Parse error: parse error, expecting `T_STRING' or `T_VARIABLE' or `T_NUM_STRING' in /blah.php on line 446

Just something to file away in case you're pulling your hair out trying to find an error that "isn't there."
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99
ohcc at 163 dot com
6 years ago
You can use variables within a pair of backticks (``).

<?php
$host
= 'www.wuxiancheng.cn';
echo `
ping -n 3 {$host}`;
?>
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0
paolo.bertani
1 year ago
If you want to avoid situations like the one described by @robert you may want to disable `shell_exec` and -as a consequence- the backtick operator.

To do this just edit the `php.ini` file and add `shell_exec` to the `disable_functions` setting:

; This directive allows you to disable certain functions.
; It receives a comma-delimited list of function names.
; https://php.net/disable-functions
disable_functions = "shell_exec"

Then you can still use `exec()` to run terminal commands.
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