在 php 语法错误中使用包含命令的命名管道

Question

$ cat a.php
<?php
system("echo <(ls)");

this script.

$ php a.php
sh: 1: Syntax error: "(" unexpected

I execute the script. But a syntax error occered.

$ echo <(ls)
/dev/fd/63

success on bash. I dont know what to do.

Answer 1

Welcome to StackOverflow!

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sh: 1: Syntax error: "(" unexpected

This error typically comes up for non-bash shells, which don't support <() expression pipes. Even when sh is bash, it'll run in a compatibility more where process substitution is not available.

It will work fine with bash.

$ echo <(ls)
/dev/fd/63

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Solutions

Solution #1

Script should always be run with bash with /bin/bash -c .

system('/bin/bash -c "echo <(ls)"');

Solution #2

Via executable script.

execute.sh

#!/bin/bash

echo <(ls)

a.php

<?php 

exec('execute.sh');