isset function in php

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showing results for - "isset function in php"
Giorgia
08 Jun 2020
1if(isset($_POST['submit']){
2//Your Code Here
3}
source
Meghan
26 Jan 2017
1if(isset($_GET['id']))
2{
3   $slide = $_GET['id'] // Getting parameter value inside PHP variable
4}
source
Tommaso
16 Mar 2018
1if (isset($variable)) { /* do something */ };
Fynn
29 Aug 2020
1if (isset($var)) {
2  // Code here
3}
Mika
12 Jan 2017
1<!DOCTYPE html>
2<html lang="en">
3<head>
4    <meta charset="UTF-8">
5    <meta http-equiv="X-UA-Compatible" content="IE=edge">
6    <meta name="viewport" content="width=device-width, initial-scale=1.0">
7    <title>Document</title>
8</head>
9<body>
10    <form action="" method="post">
11        <h1>ISSET Demo</h1>
12        <input type="submit" value="Click here" name="btn1">
13    </form>
14</body>
15</html>
16<?php
17if(isset($_POST['btn1']))
18{
19    echo "button was set!";
20}
21?>
Linus
12 Jul 2016
1/**
2 * Returns a bool (true or false)
3 */
4isset($x);
5/**
6 * Examples
7 */
8$x = 'myValue';
9if(isset($x)){
10	echo 'x is set';
11}
12/**
13 * this will echo out 'x is set'
14 */
15
16
17$x = null;
18if(isset($x)){
19	echo 'x is set';
20}
21/**
22 * This will NOT echo out 'x is set'
23 */
24
25
26if(isset($y)){
27 	echo 'y is set'; 
28}
29/**
30 * This will NOT echo out 'y is set'
31 */
32
33
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