sed 不适用于 PHP exec 函数 [英] sed doesn't work with PHP exec function

问题描述

echo "sed -i 's/NULL/\\N/g' ".$_REQUEST['para'].".sql";

上述语句有效.但是当我像这样在 exec 中使用它时它失败了......

The above statement works. But it fail when I use it in exec like this...

exec("sed -i 's/NULL//\/\/\N/g' ".$_REQUEST['para'].".sql");

推荐答案

你应该用反斜杠来转义反斜杠，而不是用正斜杠，就像这样:

You should escape backslashes with backslashes, not with forward slashes, like this:

exec("sed -i 's/NULL/\\\\N/g' ".$_REQUEST['para'].".sql");

EDIT 我在没有查看代码实际作用的情况下写了答案.不要这样做，因为 $_REQUEST['para'] 可以是用户想要的任何东西，可用于 代码注入.按照其他答案的建议使用 PHP 函数.

EDIT I wrote the answer without looking at what the code actually does. Don't do this, because $_REQUEST['para'] can be whatever the user wants, which can be used for code injection. Use the PHP functions as the other answer suggests.

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