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how to get form POST value in php

user1592
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user1592 Published in May 25, 2018, 11:10 am

This question already has an answer here:

  • PHP: “Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” 25 answers
  • PHP Undefined Index 5 answers

I need how to get form POST value on the same page. Below is my script to try and extract the value as well as the form html:

<form action="" id ='list' name= "list" class="form-inline" method="POST">
    <div class="select">
        <select name="lamp" id ="lamp" onchange="gender(this)" style="background:transparent">
            <option id ='gender' hidden="hidden">Gender</option>
            <option value="0">Boy's</option>
            <option value="1">Girl's</option>
        </select>
    </div>
</form> 

My Php code:

if (isset($_POST)) {  
    $pg_type =$_POST['lamp'];
    echo $pg_type;die;
}

I have echo the my variabe it is showing like:

Notice: Undefined index: lamp in C:\xampp\www\htdocs\rentozy\assets\includes\list-header.php on line 20

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