如何替换标题的所有字符

Question

我如何用真正的PHP函数__Chr(__Rand(98,122))替换所有__Chr(__Rand(97,122))和chr(rand(97,122))值，这些函数以通用方式提供随机和相同的参数，这里是标题：

Reply-To: __Reply-To
Bounces_to: __Bounce
Message-ID: <__Chr(__Rand(97,122))__Chr(__Rand(98,122)).__X-Mailer@__From_dn>
X-BFI: __Chr(__Rand(97,122))__Chr(__Rand(98,122))
From: __To

Answer 1

你可以使用preg_replace_callback，即：

<?php
$header = <<< LOB
Reply-To: __Reply-To
Bounces_to: __Bounce
Message-ID: <__Chr(__Rand(97,122))__Chr(__Rand(98,122)).__X-Mailer@__From_dn>
X-BFI: __Chr(__Rand(97,122))__Chr(__Rand(98,122))
From: __To
LOB;

function charCallback($matches){
$charOne = (int)$matches[1];
$charTwo = (int)$matches[2];
return chr(rand($charOne,$charTwo));
}

echo  preg_replace_callback('/__Chr\(__Rand\((\d+),(\d+)\)\)/', 'charCallback', $header);

---

输出：

Reply-To: __Reply-To
Bounces_to: __Bounce
Message-ID: <uw.__X-Mailer@__From_dn>
X-BFI: jn
From: __To

---

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