3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { function __construct() { $this->a = "hello"; $this->b = "hi"; $this->val = "howdy"; $val = "a"; echo $this->{$val}; // outputs "hello" echo "\n"; $val = "b"; echo $this->{$val}; // outputs "hi" echo "\n"; echo $this->$val; //outputs "howdy" echo "\n"; echo $this->{"val"}; } } $foo = new foo();
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Deprecated: Creation of dynamic property foo::$a is deprecated in /in/fhaj5 on line 5 Deprecated: Creation of dynamic property foo::$b is deprecated in /in/fhaj5 on line 6 Deprecated: Creation of dynamic property foo::$val is deprecated in /in/fhaj5 on line 7 hello hi hi howdy
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Creation of dynamic property foo::$a is deprecated in /in/fhaj5 on line 5 Deprecated: Creation of dynamic property foo::$b is deprecated in /in/fhaj5 on line 6 Deprecated: Creation of dynamic property foo::$val is deprecated in /in/fhaj5 on line 7 hello hi hi howdy
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
hello hi hi howdy
preferences:
224.65 ms | 403 KiB | 385 Q