blocks|key|3967815|text|这应该可以使用substr|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3967816|function+ccMasking($number,+$maskingCharacter+=+'X')+{
++++return+substr($number,+0,+4)+.+str_repeat($maskingCharacter,+strlen($number)+-+8)+.+substr($number,+-4);
}|code-block|syntax|javascript|3967817|entityMap^0|7|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

This should work using <code>substr</code>:

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

blocks|key|136529|text|您可以使用substr_replace|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|136530|$var+=+'1234123412341234';
$var+=+substr_replace($var,+str_repeat("X",+8),+4,+8);
echo+$var;|code-block|syntax|javascript|136531|输出|136532|1234XXXXXXXX1234|136533|entityMap^0|5|E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You can use <code>substr_replace</code>

<pre><code>$var = '1234123412341234';
$var = substr_replace($var, str_repeat("X", 8), 4, 8);
echo $var;
</code></pre>

Output 

<pre><code>1234XXXXXXXX1234
</code></pre>

blocks|key|5695079|text|<?php
echo+'XXXX-XXXX-XXXX-'.substr($cc,-4);
?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5695080|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;?php
echo 'XXXX-XXXX-XXXX-'.substr($cc,-4);
?&gt;
</code></pre>

blocks|key|136660|text|我的5美分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|136661|示例：|136662|371449635398431+=>+XXX-XXXX-XXXX-8431|136663|4111111111111111+=>+XXXX-1111|136664|public+function+maskCreditCardNumber($cc,+$maskFrom+=+0,+$maskTo+=+4,+$maskChar+=+'X',+$maskSpacer+=+'-')
{
++++//+Clean+out
++++$cc+++++++=+str_replace(array('-',+'+'),+'',+$cc);
++++$ccLength+=+strlen($cc);

++++//+Mask+CC+number
++++if+(empty($maskFrom)+&&+$maskTo+==+$ccLength)+{
++++++++$cc+=+str_repeat($maskChar,+$ccLength);
++++}+else+{
++++++++$cc+=+substr($cc,+0,+$maskFrom)+.+str_repeat($maskChar,+$ccLength+-+$maskFrom+-+$maskTo)+.+substr($cc,+-1+*+$maskTo);
++++}

++++//+Format
++++if+($ccLength+>+4)+{
++++++++$newCreditCard+=+substr($cc,+-4);
++++++++for+($i+=+$ccLength+-+5;+$i+>=+0;+$i--)+{
++++++++++++//+If+on+the+fourth+character+add+the+mask+char
++++++++++++if+((($i+%2B+1)+-+$ccLength)+%25+4+==+0)+{
++++++++++++++++$newCreditCard+=+$maskSpacer+.+$newCreditCard;
++++++++++++}

++++++++++++//+Add+the+current+character+to+the+new+credit+card
++++++++++++$newCreditCard+=+$cc[$i]+.+$newCreditCard;
++++++++}
++++}+else+{
++++++++$newCreditCard+=+$cc;
++++}

++++return+$newCreditCard;
}|code-block|syntax|javascript|136665|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

My 5 cents.

Examples: 
371449635398431 => XXX-XXXX-XXXX-8431 
4111111111111111 => XXXX-XXXX-XXXX-1111

<pre><code>public function maskCreditCardNumber($cc, $maskFrom = 0, $maskTo = 4, $maskChar = 'X', $maskSpacer = '-')
{
 // Clean out
 $cc = str_replace(array('-', ' '), '', $cc);
 $ccLength = strlen($cc);

 // Mask CC number
 if (empty($maskFrom) &amp;&amp; $maskTo == $ccLength) {
 $cc = str_repeat($maskChar, $ccLength);
 } else {
 $cc = substr($cc, 0, $maskFrom) . str_repeat($maskChar, $ccLength - $maskFrom - $maskTo) . substr($cc, -1 * $maskTo);
 }

 // Format
 if ($ccLength &gt; 4) {
 $newCreditCard = substr($cc, -4);
 for ($i = $ccLength - 5; $i &gt;= 0; $i--) {
 // If on the fourth character add the mask char
 if ((($i + 1) - $ccLength) % 4 == 0) {
 $newCreditCard = $maskSpacer . $newCreditCard;
 }

 // Add the current character to the new credit card
 $newCreditCard = $cc[$i] . $newCreditCard;
 }
 } else {
 $newCreditCard = $cc;
 }

 return $newCreditCard;
}
</code></pre>

blocks|key|3485003|text|假设：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3485004|3485005|信用卡号码可能包含在一个包含更多内容的较大字符串中|unordered-list-item|3485006|所有主要信用卡都使用Luhn算法https://en.wikipedia.org/wiki/Luhn_algorithm|offset|length|3485007|进行和检查|3485008|这就是我要做的：|3485009|3485010|我通过正则表达式检测字符串是否包含由空格和连字符分隔的数字链。|3485011|对于每个匹配项，我会将其从非数字值中剥离，并检查它是否是我想要的具有替换字符(通常是“*”)的部分。|3485012|3485013|代码是这样的：|3485014|public+function+mask($string)
{
++++$regex+=+'/(?:\d[+\t-]*?){13,19}/m';

++++$matches+=+[];

++++preg_match_all($regex,+$string,+$matches);

++++//+No+credit+card+found
++++if+(!isset($matches[0])+%7C%7C+empty($matches[0]))
++++{
++++++++return+$string;
++++}

++++foreach+($matches+as+$match_group)
++++{
++++++++foreach+($match_group+as+$match)
++++++++{
++++++++++++$stripped_match+=+preg_replace('/[%5E\d]/',+'',+$match);

++++++++++++//+Is+it+a+valid+Luhn+one?
++++++++++++if+(false+===+$this->_util_luhn->isLuhn($stripped_match))
++++++++++++{
++++++++++++++++continue;
++++++++++++}

++++++++++++$card_length+=+strlen($stripped_match);
++++++++++++$replacement+=+str_pad('',+$card_length+-+4,+$this->_replacement)+.+substr($stripped_match,+-4);

++++++++++++//+If+so,+replace+the+match
++++++++++++$string+=+str_replace($match,+$replacement,+$string);
++++++++}
++++}

++++return+$string;
}|code-block|syntax|javascript|3485015|您将看到对$this->_util_luhn->isLuhn的调用，这是一个执行以下操作的函数：|3485016|public+function+isLuhn($input)
{

++++if+(!is_numeric($input))
++++{
++++++++return+false;
++++}

++++$numeric_string+=+(string)+preg_replace('/\D/',+'',+$input);

++++$sum+=+0;

++++$numDigits+=+strlen($numeric_string)+-+1;

++++$parity+=+$numDigits+%25+2;

++++for+($i+=+$numDigits;+$i+>=+0;+$i--)
++++{
++++++++$digit+=+substr($numeric_string,+$i,+1);

++++++++if+(!$parity+==+($i+%25+2))
++++++++{
++++++++++++$digit+<<=+1;
++++++++}

++++++++$digit+=+($digit+>+9)
++++++++++++?+($digit+-+9)
++++++++++++:+$digit;

++++++++$sum+%2B=+$digit;
++++}

++++return+(0+==+($sum+%25+10));
}|3485017|这就是我在https://github.com/pachico/magoo/中实现它的方式。希望你会发现它是有用的。|3485018|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Luhn_algorithm|1|https://github.com/pachico/magoo/^0|0|0|0|G|18|0|0|0|0|0|0|0|0|0|0|0|0|5|X|1|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1I|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|1J|8|@]|9|@$H|1K|I|1L|1|1M]]|A|$]]|$1|J|3|K|5|6|7|1N|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1O|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|O|3|P|5|E|7|1Q|8|@]|9|@]|A|$]]|$1|Q|3|R|5|E|7|1R|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1T|8|@]|9|@]|A|$]]|$1|V|3|W|5|X|7|1U|8|@]|9|@]|A|$Y|Z]]|$1|10|3|11|5|6|7|1V|8|@]|9|@]|A|$]]|$1|12|3|13|5|X|7|1W|8|@]|9|@]|A|$Y|Z]]|$1|14|3|15|5|6|7|1X|8|@]|9|@$H|1Y|I|1Z|1|20]]|A|$]]|$1|16|3|-4|5|6|7|21|8|@]|9|@]|A|$]]]|17|$18|$5|19|1A|1B|A|$1C|1D]]|1E|$5|19|1A|1B|A|$1C|1F]]]]

Assuming that:

<ul>
<li>Credit card numbers might be contained in a bigger string containing more content</li>
<li>All major credit cards are sum-checked using the Luhn algorithm <a href="https://en.wikipedia.org/wiki/Luhn_algorithm" rel="nofollow">https://en.wikipedia.org/wiki/Luhn_algorithm</a></li>
</ul>

This is what I do:

<ul>
<li>I detect, via regex, if a string contains a chain of digits, separated or not by spaces and hyphens.</li>
<li>For every match, I strip it from non-numeric values and check if is a valid Luhn.</li>
<li>Replace the part I want, for every match, with replacement characters (usually "*").</li>
</ul>

The code is this:

<pre><code>public function mask($string)
{
 $regex = '/(?:\d[ \t-]*?){13,19}/m';

 $matches = [];

 preg_match_all($regex, $string, $matches);

 // No credit card found
 if (!isset($matches[0]) || empty($matches[0]))
 {
 return $string;
 }

 foreach ($matches as $match_group)
 {
 foreach ($match_group as $match)
 {
 $stripped_match = preg_replace('/[^\d]/', '', $match);

 // Is it a valid Luhn one?
 if (false === $this-&gt;_util_luhn-&gt;isLuhn($stripped_match))
 {
 continue;
 }

 $card_length = strlen($stripped_match);
 $replacement = str_pad('', $card_length - 4, $this-&gt;_replacement) . substr($stripped_match, -4);

 // If so, replace the match
 $string = str_replace($match, $replacement, $string);
 }
 }

 return $string;
}
</code></pre>

You will see a call to $this->_util_luhn->isLuhn, which is a function that does this:

<pre><code>public function isLuhn($input)
{

 if (!is_numeric($input))
 {
 return false;
 }

 $numeric_string = (string) preg_replace('/\D/', '', $input);

 $sum = 0;

 $numDigits = strlen($numeric_string) - 1;

 $parity = $numDigits % 2;

 for ($i = $numDigits; $i &gt;= 0; $i--)
 {
 $digit = substr($numeric_string, $i, 1);

 if (!$parity == ($i % 2))
 {
 $digit &lt;&lt;= 1;
 }

 $digit = ($digit &gt; 9)
 ? ($digit - 9)
 : $digit;

 $sum += $digit;
 }

 return (0 == ($sum % 10));
}
</code></pre>

It is how I implemented it in <a href="https://github.com/pachico/magoo/" rel="nofollow">https://github.com/pachico/magoo/</a>.
Hope you find it useful.

blocks|key|3967887|text|使用正则表达式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3967888|function+cc_masking(+$number,+$maskChar+=+'X'+)+{
++++return+preg_replace(
++++++++'/%5E(....).*(....)$/',
++++++++'\1'+.+str_repeat(+$maskChar,+strlen(+$number+)+-+8)+.+'\2',
++++++++$number+);
}|code-block|syntax|javascript|3967889|保留前四个字符(和最后四个字符)，将其他字符替换为X。|3967890|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

With regular expression

<pre><code>function cc_masking( $number, $maskChar = 'X' ) {
 return preg_replace(
 '/^(....).*(....)$/',
 '\1' . str_repeat( $maskChar, strlen( $number ) - 8) . '\2',
 $number );
}
</code></pre>

You keep the first four characters (and the last four), replacing the others with X.

blocks|key|136694|text|如果你只想显示最后4位数，这里有一个动态的方法。适用于信用卡，ACH号码或任何东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|136695|https://gist.github.com/khoipro/815ea292e2e87e10771474dc2ef401ef|offset|length|136696|++++$variable+=+'123123123';
++++$length+=+strlen($variable);
++++$output+=+substr_replace($variable,+str_repeat('X',+$length+-+4),+0,+$length+-+4);
++++echo+$output;|code-block|syntax|javascript|136697|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1S|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|C]]]]

If you wish to show only last 4 digits, here is a dynamic way. Works with both credit cards, ACH numbers or anything:

<a href="https://gist.github.com/khoipro/815ea292e2e87e10771474dc2ef401ef" rel="nofollow noreferrer">https://gist.github.com/khoipro/815ea292e2e87e10771474dc2ef401ef</a>

<pre><code> $variable = '123123123';
 $length = strlen($variable);
 $output = substr_replace($variable, str_repeat('X', $length - 4), 0, $length - 4);
 echo $output;
</code></pre>

blocks|key|3484852|text|这不需要使用正则表达式。只需在开头取n个数字，在末尾取n个数字，然后在中间加上X即可完成。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3484853|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

No need for regular expression for this. Just take n numbers at the beginning, n numbers at the end then add the X in the middle to complete.

blocks|key|136525|text|不是一种优雅的方式，但它是有效的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|136526|<?php
+++++$cc+=+"1234123412341234";
+++++function+cc_masking($number)+{
+++++$int_first+=+4;
+++++$int_last+=+4;
+++++$chars+=+strlen($number);
+++++$repeater+=+"x";
+++++$repeates+=+$chars-$int_first-$int_last;
+++++//+echo+"Org:+$number";
+++++$mask+=+substr($number,0,4).str_repeat($repeater,$repeates).substr($cc,-4);
+++++//+echo+"Mask:+$mask";
+++++++++return+$mask;
++++++}
+++++echo+cc_masking($cc);
++?>|code-block|syntax|javascript|136527|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Not the elegant way but it works

<pre><code>&lt;?php
 $cc = "1234123412341234";
 function cc_masking($number) {
 $int_first = 4;
 $int_last = 4;
 $chars = strlen($number);
 $repeater = "x";
 $repeates = $chars-$int_first-$int_last;
 // echo "&lt;p&gt;Org: $number&lt;/p&gt;";
 $mask = substr($number,0,4).str_repeat($repeater,$repeates).substr($cc,-4);
 // echo "&lt;p&gt;Mask: $mask";
 return $mask;
 }
 echo cc_masking($cc);
 ?&gt;
</code></pre>

blocks|key|3968052|text|我在找一些类似的代码。所以我找到了下面的代码。我希望能帮上忙。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3968053|function+mask($val,+$mask)
{
++++$maskared+=+'';

++++$k+=+0;

++++for+($i+=+0;+$i+<=+strlen($mask)+-+1;+$i%2B%2B)+{
++++++++if+($mask[$i]+==+'#')+{
++++++++++++if+(isset($val[$k]))
++++++++++++++++$maskared+.=+$val[$k%2B%2B];
++++++++}+else+{
++++++++++++if+(isset($mask[$i]))
++++++++++++++++$maskared+.=+$mask[$i];
++++++++}
++++}

++++return+$maskared;
}|code-block|syntax|javascript|3968054|示例：|3968055|echo+mask(11111111111,+"###.###.###-##");+//+111.111.111-11
echo+mask(11111111111,+"#####-###");+//+111111-111
echo+mask(11111111111,+anything);+//+111111-111|3968056|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I was looking for some code similar. So I found the code below. I hope can help.
<pre><code>function mask($val, $mask)
{
 $maskared = '';

 $k = 0;

 for ($i = 0; $i &lt;= strlen($mask) - 1; $i++) {
 if ($mask[$i] == '#') {
 if (isset($val[$k]))
 $maskared .= $val[$k++];
 } else {
 if (isset($mask[$i]))
 $maskared .= $mask[$i];
 }
 }

 return $maskared;
}
</code></pre>
Sample:
<pre><code>echo mask(11111111111, &quot;###.###.###-##&quot;); // 111.111.111-11
echo mask(11111111111, &quot;#####-###&quot;); // 111111-111
echo mask(11111111111, anything); // 111111-111
</code></pre>

blocks|key|5695336|text|str_pad(substr($value,-4),strlen($value),+"X",+STR_PAD_LEFT);+//output:+XXXXXXXXXXXX9494|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5695337|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>str_pad(substr($value,-4),strlen($value), &quot;X&quot;, STR_PAD_LEFT); //output: XXXXXXXXXXXX9494
</code></pre>

blocks|key|3485073|text|$accNum+=+"1234123412341234";

$accNum1+=+substr($accNum,2,2);

$accNum1+=+'**'.$accNum1;

$accNum2+=+substr($accNum,6,100);

$accNum2+=+'**'.$accNum2;

$accNum+=+$accNum1.$accNum2;

echo+$accNum;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3485074|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$accNum = "1234123412341234";

$accNum1 = substr($accNum,2,2);

$accNum1 = '**'.$accNum1;

$accNum2 = substr($accNum,6,100);

$accNum2 = '**'.$accNum2;

$accNum = $accNum1.$accNum2;

echo $accNum;
</code></pre>

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

<pre><code>$cc = 1234123412341234

echo cc_masking($cc)

1234XXXXXXXX1234

function cc_masking($number) {.....}
</code></pre>

Please suggest the regular expression for this.

Mask credit card number in PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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功能1上新10个字符

功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符。

功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符。

功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符

功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符

功能4上新

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社区新版编辑器体验调研

我有要掩码的信用卡号码，如下所示：$cc = 1234123412341234echo cc_masking($cc)1234XXXXXXXX1234function cc_masking($number) {.....}为此，请建议使用正则表达式。

问在PHP中屏蔽信用卡号
EN

回答 12

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问在PHP中屏蔽信用卡号EN

回答 12

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问在PHP中屏蔽信用卡号
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