3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { function __toString() { return "bar";}} $a = new foo(); echo $a; $bar = "hello"; echo $$a;
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 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 - 7.2.33, 7.3.0 - 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
barhello
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6
bar Notice: Object of class foo to string conversion in /in/Kb9QZ on line 6 Notice: Undefined variable: Object in /in/Kb9QZ on line 6
Output for 5.0.0 - 5.0.3
bar Notice: Object of class foo to string conversion in /in/Kb9QZ on line 6 Notice: Undefined variable: Object in /in/Kb9QZ on line 6
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
Object Notice: Object to string conversion in /in/Kb9QZ on line 6 Notice: Undefined variable: Object in /in/Kb9QZ on line 6

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