Detailed example of how PHP determines the strength of a password

The

website is a detection website that can help users test the password security they have set and the time it takes to crack it. Its purpose is to tell users not to set the password to a simple 123456, but to include Numbers, letters, special symbols, etc., improve the security capabilities of passwords. This article mainly introduces how to use php to determine the strength of a password. The examples 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>

三、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();
        }
    });
}

四、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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