如何使变量在单引号中正常工作? [英] How to make variables work in Single Quotes properly?

问题描述

我希望这些变量用它们的值填充，但是在config.php文件中写入变量名本身，我希望像$ host在config.php文件中转换为带有单引号的'localhost'.

I want those variables to be filled with their values, but in config.php file its writing the variable name itself, I want like $host convert to 'localhost' with single quotes in the config.php file.

    $handle = fopen('../config.php', 'w');
    fwrite($handle, '
    <?php
    $connection = mysql_connect({$host}, {$user}, {$pass});
    ?>
    ');
    fclose($handle);

推荐答案

如果在单引号中使用变量，它们将被表示为字符串而不是变量.

If you use variables within single quotes, they will be represented as strings instead of variables.

您也可以这样:

// Get from $_SESSION (if started)
$host = $_SESSION['host'];
$user = $_SESSION['user'];
$pass = $_SESSION['pass'];

$handle = fopen('../config.php', 'w');

// try with the {}
$content = '<?php $connection = mysql_connect('."{$host},"."{$user},"."{$pass});".'?>';

// or you can try this too, but comment out the other one:
$content = '<?php $connection = mysql_connect('."\"$host\","."\"$user\","."\"$pass\");".'?>';

fwrite($handle, $content);
fclose($handle);

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