How to determine password strength in PHP

This article mainly introduces the method of judging password strength in PHP, involving implementation techniques related to PHP regularity judgment, ajax interaction and dynamic operation of page elements. Friends in need can refer to it

The details are as follows:

1. PHP page

$score = 0;
if(!empty($_GET['value'])){ //接收的值
    $str = $_GET['value'];
} else{
    $str = '';
}
if(preg_match("/[0-9]+/",$str))
{
    $score ++;
}
if(preg_match("/[0-9]{3,}/",$str))
{
    $score ++;
}
if(preg_match("/[a-z]+/",$str))
{
    $score ++;
}
if(preg_match("/[a-z]{3,}/",$str))
{
    $score ++;
}
if(preg_match("/[A-Z]+/",$str))
{
    $score ++;
}
if(preg_match("/[A-Z]{3,}/",$str))
{
    $score ++;
}
if(preg_match("/[_|\-|+|=|*|!|@|#|$|%|^|&|(|)]+/",$str))
{
    $score += 2;
}
if(preg_match("/[_|\-|+|=|*|!|@|#|$|%|^|&|(|)]{3,}/",$str))
{
    $score ++ ;
}
if(strlen($str) >= 10)
{
    $score ++;
}
echo $score;
exit;

##2. Html page

<table cellspacing="0" cellpadding="0">
<tr>
<td>输入密码：</td>
<td colspan="4"><input type="password" value="" name="newpwd" onblur="getPassword();" />
</tr>
<tr>
<td>密码强度：</td>
<td id="idSM1" align="middle" width="20%"><span style="height:0px; line-height:0px;"> </span><span id="idSMT1" style="DISPLAY: none">弱</span></td>
<td id="idSM2" style="BORDER-LEFT: #fff 1px solid" align="middle" width="20%"><span style="height:0px; line-height:0px;"> </span><span id="idSMT0" style="DISPLAY:inline; FONT-WEIGHT: normal; COLOR: #666">无</span><span id="idSMT2" style="DISPLAY: none">中等</span></td>
<td id="idSM3" style="BORDER-LEFT: #fff 1px solid" align="middle" width="20%"><span style="height:0px; line-height:0px;"> </span><span id="idSMT3" style="DISPLAY: none">强</span></td>
<td id="idSM4" style="BORDER-LEFT: #fff 1px solid" align="middle" width="20%"> <span style="height:0px; line-height:0px;"> </span><span id="idSMT4" style="DISPLAY: none">极好</span></td>
</tr>
</table>

3.js

<script>
function getPassword(){
    var value = $("input[name=&#39;newpwd&#39;]").attr(&#39;value&#39;);
    $.get(&#39;index.php?r=account/testpwd&#39;,{value:value},function(data){
        if(data>=1 && data<=3){
            $(&#39;#idSM1&#39;).attr(&#39;class&#39;,&#39;pwdChkCon1&#39;); //弱
            $(&#39;#idSM2&#39;).attr(&#39;class&#39;,&#39;pwdChkCon0&#39;);
            $(&#39;#idSM3&#39;).attr(&#39;class&#39;,&#39;pwdChkCon0&#39;);
            $(&#39;#idSM4&#39;).attr(&#39;class&#39;,&#39;pwdChkCon0&#39;);
            $(&#39;#idSMT1&#39;).show();
            $(&#39;#idSMT0&#39;).hide();
            $(&#39;#idSMT2&#39;).hide();
            $(&#39;#idSMT3&#39;).hide();
            $(&#39;#idSMT4&#39;).hide();
        } else if(data>=4 && data<=6){ //中等
            $(&#39;#idSM1&#39;).attr(&#39;class&#39;,&#39;pwdChkCon2&#39;);
            $(&#39;#idSM2&#39;).attr(&#39;class&#39;,&#39;pwdChkCon2&#39;);
            $(&#39;#idSM3&#39;).attr(&#39;class&#39;,&#39;pwdChkCon0&#39;);
            $(&#39;#idSM4&#39;).attr(&#39;class&#39;,&#39;pwdChkCon0&#39;);
            $(&#39;#idSMT0&#39;).hide();
            $(&#39;#idSMT1&#39;).hide();
            $(&#39;#idSMT2&#39;).show();
            $(&#39;#idSMT3&#39;).hide();
            $(&#39;#idSMT4&#39;).hide();
        } else if(data>=7 && data<=8){ //强
            $(&#39;#idSM1&#39;).attr(&#39;class&#39;,&#39;pwdChkCon3&#39;);
            $(&#39;#idSM2&#39;).attr(&#39;class&#39;,&#39;pwdChkCon3&#39;);
            $(&#39;#idSM3&#39;).attr(&#39;class&#39;,&#39;pwdChkCon3&#39;);
            $(&#39;#idSM4&#39;).attr(&#39;class&#39;,&#39;pwdChkCon0&#39;);
            $(&#39;#idSMT0&#39;).hide();
            $(&#39;#idSMT1&#39;).hide();
            $(&#39;#idSMT2&#39;).hide();
            $(&#39;#idSMT3&#39;).show();
            $(&#39;#idSMT4&#39;).hide();
        } else if(data>=9 && data<=10){ //极好
            $(&#39;#idSM1&#39;).attr(&#39;class&#39;,&#39;pwdChkCon4&#39;);
            $(&#39;#idSM2&#39;).attr(&#39;class&#39;,&#39;pwdChkCon4&#39;);
            $(&#39;#idSM3&#39;).attr(&#39;class&#39;,&#39;pwdChkCon4&#39;);
            $(&#39;#idSM4&#39;).attr(&#39;class&#39;,&#39;pwdChkCon4&#39;);
            $(&#39;#idSMT0&#39;).hide();
            $(&#39;#idSMT1&#39;).hide();
            $(&#39;#idSMT2&#39;).hide();
            $(&#39;#idSMT3&#39;).hide();
            $(&#39;#idSMT4&#39;).show();
        }
    });
}

4.css

<style>
.pwdChkCon0 {BORDER-RIGHT: #bebebe 1px solid;BORDER-BOTTOM: #bebebe 1px solid;BACKGROUND-COLOR: #ebebeb;TEXT-ALIGN: center;}
.pwdChkCon1 {BORDER-RIGHT: #bb2b2b 1px solid;BORDER-BOTTOM: #bb2b2b 1px solid;BACKGROUND-COLOR: #ff4545;TEXT-ALIGN: center;}
.pwdChkCon2 {BORDER-RIGHT: #e9ae10 1px solid;BORDER-BOTTOM: #e9ae10 1px solid;BACKGROUND-COLOR: #ffd35e;TEXT-ALIGN: center;}
.pwdChkCon3 {BORDER-RIGHT: #267a12 1px solid;BORDER-BOTTOM: #267a12 1px solid;BACKGROUND-COLOR: #3abb1c;TEXT-ALIGN: center;}
.pwdChkCon4 {BORDER-RIGHT: #267a12 1px solid;BORDER-BOTTOM: #267a12 1px solid;BACKGROUND-COLOR: #3abb1c;TEXT-ALIGN: center;}
</style>

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