如何使用PHP在表单中找到移动复制

I have create the form with selection option. Based on the selection i show and hide form field.... How to validate the mobile no. If the user enter same mobile no again then throw the error message. How to find the mobile duplication entry

我已经创建了带有选择选项的表单。基于选择我显示和隐藏表单字段....如何验证移动号码。如果用户再次输入相同的移动设备,则抛出错误消息。如何查找移动复制条目

$(document).ready(function() {
 $('#hidden-div').hide();
 $("#select_btn").change(function() {
    toggleFields();
  });
  });

function toggleFields() {
  var selectVal = $("#select_btn").val();
  if (selectVal <= 5) {
    $hiddenHtml = $('#hidden-div').clone().html();
    $("#refer").html('');
    for (var i = 0; i < selectVal; i++) {
      $("#refer").append($hiddenHtml);
    }
  }
}

function InvalidMsg(textbox) {

     if(textbox.validity.patternMismatch){
        textbox.setCustomValidity('please enter valid mobile number');
    }    
    else {
        textbox.setCustomValidity('');
    }
    return true;
}

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<html>
<head>
<title> Demo </title>
<meta name="robots" content="noindex, nofollow" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<form id ="refer-form" name="refer-form"   method="post" >
 
  <p>No of Referrer:
    <select id="select_btn" onchange="toggleFields();">
      <option value="0">--Select--</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
    </select>
    <div id="hidden-div">
 <div id="text">Referrer</div>
      <p>Name:
        <input type="text" name="name[]" class="name"/>
      </p>
      <p>Mobile:
        <input type="text" name="mobile[]" class="mobile" oninvalid="InvalidMsg(this);" />
      </p>
      <p>Email:
        <input type="text" name="email[]" />
      </p>
      
    </div>
    <div id="refer">

    </div>
    <p align="center">
      <input type="submit" value="Submit" />
    </p>
</form>

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