屏蔽PHP中的信用卡号 [英] Mask credit card number in PHP

问题描述

我有要屏蔽的信用卡号，如下所示:

I have credit card number which I want to mask as below:

$cc = 1234123412341234

echo cc_masking($cc)

1234XXXXXXXX1234

function cc_masking($number) {.....}

请为此提出正则表达式.

Please suggest the regular expression for this.

推荐答案

这应该使用substr起作用:

function ccMasking($number, $maskingCharacter = 'X') {
    return substr($number, 0, 4) . str_repeat($maskingCharacter, strlen($number) - 8) . substr($number, -4);
}

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