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<!DOCTYPE html>
<html>
<body>
<?php
date_default_timezone_set('America/Chicago');
?><p><?php
// variable $user is the value of $_GET['user']
// and 'anonymous' if it does not exist
echo $user = $_GET["user"] ?? "anonymous";
echo("<br>");
// variable $color is "red" if $color does not exist or is null
echo $color = $color ?? "red";
echo("<br>");
$color = 5;
echo $color = $color ?? "red";
?><p><h3>Chaining ternary operators</h3><?php
$eligible = true;
$has_credit = false;
$message = $eligible
? ($has_credit
? 'Can use the credit'
: 'Not enough credit')
: 'Not eligible to buy';
echo $message;
echo("<br>");
$eligible = true;
$has_credit = true;
$message = $eligible
? ($has_credit
? 'Can use the credit'
: 'Not enough credit')
: 'Not eligible to buy';
echo $message;
echo("<br>");
$eligible = false;
$has_credit = false;
$message = $eligible
? ($has_credit
? 'Can use the credit'
: 'Not enough credit')
: 'Not eligible to buy';
echo $message;
echo("<br>");
$x = 1;
$y = 2;
$message = $x > $y ? 'bigger' : ( $x < $y ? 'smaller' : 'same' ) ;
echo $message;
echo("<br>");
$y = 0;
$message = $x > $y ? 'bigger' : ( $x < $y ? 'smaller' : 'same' ) ;
echo $message;
echo("<br>");
$y = 1;
$message = $x > $y ? 'bigger' : ( $x < $y ? 'smaller' : 'same' ) ;
echo $message;
echo("<br>");
?><p><h3>Null coalescing operator</h3><?php
$username = $username ?? 'nobody';
echo $username;
echo("<br>");
if (!isset($ooga)) { $ooga = 'ooga was not set'; }
echo $ooga;
echo("<br>");
if (empty($booga)) { $booga = 'booga was empty'; }
echo $booga;
echo("<br>");
if ($z != 5) {
$z = 'z is not 5';
}
echo $z;
echo("<br>");
$var = 0;
// Evaluates to true because $var is empty
if (empty($var)) {
echo '$var is either 0, empty, or not set at all';
}
echo("<br>");
// Evaluates as true because $var is set
if (isset($var)) {
echo '$var is set even though it is empty';
}
?>
</body>
</html>