php isset

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showing results for - "php isset"
Auguste
01 Jan 2021
1$var = $var ?? "default";
source
Hector
06 Jan 2018
1if (isset($variable)) { /* do something */ };
source
Riccardo
14 Apr 2018
1if (isset($var)) {
2  // Code here
3}
Niklas
05 Sep 2017
1<!DOCTYPE html>
2<html lang="en">
3<head>
4    <meta charset="UTF-8">
5    <meta http-equiv="X-UA-Compatible" content="IE=edge">
6    <meta name="viewport" content="width=device-width, initial-scale=1.0">
7    <title>Document</title>
8</head>
9<body>
10    <form action="" method="post">
11        <h1>ISSET Demo</h1>
12        <input type="submit" value="Click here" name="btn1">
13    </form>
14</body>
15</html>
16<?php
17if(isset($_POST['btn1']))
18{
19    echo "button was set!";
20}
21?>
Daire
08 Jul 2019
1if (isset($val)) {
2}
Johnathon
07 Apr 2016
1
2<?php
3
4$var = '';
5
6// This will evaluate to TRUE so the text will be printed.
7if (isset($var)) {
8    echo "This var is set so I will print.";
9}
10
11// In the next examples we'll use var_dump to output
12// the return value of isset().
13
14$a = "test";
15$b = "anothertest";
16
17var_dump(isset($a));      // TRUE
18var_dump(isset($a, $b)); // TRUE
19
20unset ($a);
21
22var_dump(isset($a));     // FALSE
23var_dump(isset($a, $b)); // FALSE
24
25$foo = NULL;
26var_dump(isset($foo));   // FALSE
27
28?>
29
30
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