<?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);
}
}
$coal = new Coalescing();
var_dump($coal->attribute1 ?? 'default');
var_dump($coal->attribute2 ?? 'default');
- Output for 7.0.6 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- 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/QgN2g on line 16
string(7) "default"
- Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
- Parse error: syntax error, unexpected '?' in /in/QgN2g on line 30
Process exited with code 255.
preferences:
247.75 ms | 402 KiB | 327 Q