isset submit in php

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1if(isset($_POST['submit']){
2//Your Code Here
3}

1<!DOCTYPE html>
2<html lang="en">
3<head>
4    <meta charset="UTF-8">
5    <meta http-equiv="X-UA-Compatible" content="IE=edge">
6    <meta name="viewport" content="width=device-width, initial-scale=1.0">
7    <title>Document</title>
8</head>
9<body>
10    <form action="" method="post">
11        <h1>ISSET Demo</h1>
12        <input type="submit" value="Click here" name="btn1">
13    </form>
14</body>
15</html>
16<?php
17if(isset($_POST['btn1']))
18{
19    echo "button was set!";
20}
21?>

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