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Php Code: Adding two numbers function

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Adding two numbers and return the result.

<html>
<head>
<style type="text/css">
 #add{margin-left:200px;}
 #tit{color:red;margin-left:50px;margin-top:20px;font-family:Arial;font-size:30px;}
.num{font-family:Budoni;color:green;}
#res{color:blue;font-family:Sans-serif;margin-left:50px;}
#result{color:red;width:70px;}
</style>
</head>
<body>
<?php
  
    $num1="0";
    $num2="0";
    $res="0";
 
 if(!empty($_POST["num1"]) && !empty($_POST["num2"]) ){
  $num1=$_POST["num1"];
  $num2=$_POST["num2"];
  $res=$num1+$num2;
 }   

?>
<form method="post">
<label id="tit">| Adding Two numbers using php Function |</label>
<br/><br/>
<label class="num">Input 1st number : <input type="text" name="num1" value="<?php echo $num1; ?>";/></label><br/><br/>
<label class="num">Input 2nd number : <input type="text" name="num2" value="<?php echo $num2; ?>" /></label>
<br/><br/>
<input type="submit" value="ADD"  id="add"/>
<input type="reset" value="reset">
 </form>
 <label id="res">RESULT : <input type="text" value="<?php echo $res;  ?>"  disabled="yes" id="result" /></label>
   
 </body>
 </html>

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