- Output for 7.3.33, 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
- false true true false false
<?php
// $_GET['myvar'] is unset
echo $_GET['myvar'] ?? '' == 'hello' ? "true\n" : "false\n";
// $_GET['myvar'] is set but != 'hello'
$_GET['myvar'] = 'farewell';
echo $_GET['myvar'] ?? '' == 'hello' ? "true\n" : "false\n";
// $_GET['myvar'] is set and == 'hello'
$_GET['myvar'] = 'hello';
echo $_GET['myvar'] ?? '' == 'hello' ? "true\n" : "false\n";
// $_GET['myvar'] is set but "falsey"
$_GET['myvar'] = 0;
echo $_GET['myvar'] ?? '' == 'hello' ? "true\n" : "false\n";
$_GET['myvar'] = '';
echo $_GET['myvar'] ?? '' == 'hello' ? "true\n" : "false\n";