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run code in 300+ PHP versions simultaneously

@ 2015-06-17T01:35:02Z

<?php


class SomethingBuilder
{
    protected $value;
    protected $listeners = [];
    
    protected function dispatchEvent($evt){
        foreach($this->listeners as $listener)
            $listener($evt);
    }
    function addEventListener($listener){
        $this->listeners[] = $listener;
    }
    function getValue(){
        return $this->value;
    }
    function setValue($value){
        $this->dispatchEvent('beforechange');
        $this->value = $value;
    }
    function freeze(){
        return new SomethingFinalBuilderWrapper($this);
    }
}

class SomethingFinalBuilderWrapper
{
    protected $builder;

    function __construct(SomethingBuilder $builder){
        $this->builder = $builder;
        $this->builder->addEventListener(function($evt){
            if($evt !== 'beforechange') return;
            // if(refcount($builder) > 1)
            $this->builder = clone $this->builder;
            echo "clone happened\n";
        });
    }
    
    function getValue(){
        return $this->builder->getValue();
    }
}

$x = new SomethingBuilder();
$x->setValue(10);
echo $x->getValue() . "\n";

$y = $x->freeze();
echo $y->getValue() . "\n";

$x->setValue(20);

echo $y->getValue() . "\n";
echo $x->getValue() . "\n";

Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.2.19, 8.3.0 - 8.3.7: 10 10 clone happened 10 20
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/9A4MB on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/9A4MB on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/9A4MB on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/9A4MB on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/9A4MB on line 6
Process exited with code 255.

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