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run code in 200+ php & hhvm versions
Bugs & Features
<?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 - 7.2.0
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 5.4.11 - 5.6.28
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/5ZJJr on line 5
Process exited with code 255.