<?php
class Coalescing
{
protected $attributes = [
'attribute1' => 'value1',
];
public function __get($name)
{
print "GET\n";
if (array_key_exists($name, $this->attributes)) {
return $this->attributes[$name];
}
trigger_error("Property $name does not exist");
return null;
}
public function __isset($name)
{
print "ISSET\n";
return array_key_exists($name, $this->attributes);
}
}
$coal = new Coalescing();
defined("T_COALESCE") && eval('var_dump($coal->attribute1 ?? "default");');
//GET
//string(6) "value1"
defined("T_COALESCE") && eval('var_dump($coal->attribute2 ?? "default");');
//GET
//PHP Notice: Property attribute2 does not exist in /var/www/html/test.php on line 23
//PHP Stack trace:
//PHP 1. {main}() /var/www/html/test.php:0
//PHP 2. Coalescing->__get() /var/www/html/test.php:41
//PHP 3. trigger_error() /var/www/html/test.php:23
///var/www/html/test.php:41:
//string(7) "default"
- Output for 7.0.6 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- ISSET
GET
string(6) "value1"
ISSET
string(7) "default"
- Output for 7.0.0 - 7.0.5
- GET
string(6) "value1"
GET
Notice: Property attribute2 does not exist in /in/5ZJJr on line 16
string(7) "default"
- Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
preferences:
188.79 ms | 401 KiB | 179 Q