null coalescing operator example in php
$name = $_GET['name'] ?? $_POST['name'] ?? 'nobody';
//it is equavelent to below conditions
if (isset($_GET['name'])) {
$name = $_GET['name'];
} elseif (isset($_POST['name'])) {
$name = $_POST['name'];
} else {
$name = 'nobody';
}use ternary operator as null coalescing operator in php
<?php
$a = null;
print $a ?? 'b'; // b
print "n";
print $a ?: 'b'; // b
print "n";
print $c ?? 'a'; // a
print "n";
print $c ?: 'a'; // Notice: Undefined variable: c in /in/apAIb on line 14
print "n";
$b = array('a' => null);
print $b['a'] ?? 'd'; // d
print "n";
print $b['a'] ?: 'd'; // d
print "n";
print $b['c'] ?? 'e'; // e
print "n";
print $b['c'] ?: 'e'; // Notice: Undefined index: c in /in/apAIb on line 33
print "n";Copyright © 2021 Codeinu
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