isset in php

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1if (isset($var)) {
2  // 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?>

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

1$age = 0;
2// Evaluates as true because $age is set
3if (isset($age)) {
4echo '$age is set even though it is empty';
5}

1The isset() function checks whether a variable is set, which means that it has to be declared and is not NULL.
2
3This function returns true if the variable exists and is not NULL, otherwise it returns false.

1//with new features in new PHP versions like 7
2//you can simplify writing of isset in the following way,
3//old way of isset to display name if name variable is not null
4echo isset($name) ? $name : "no name"
5 //new and simple way with null coalescing operator
6echo $name ?? "no name"

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