PHP判断密码强度的方法详解

$score = 0;
if(!empty($_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;

<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>

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

<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>