Online PHP editor | output for vONXX

@ 2021-10-08T06:47:00Z

<?php

class Foo
{
    private array $elements = [];

    public function __construct(int $howMany)
    {
        for ($i = 0; $i < $howMany; $i++) {
            $this->elements[] = random_int(1, 100);
        }
    }
    
    public function &getElements():array {
        return $this->elements;
    }

}

class Demo
{
    public Foo $foo;

    public function __construct(int $howMany)
    {
        $this->foo = new Foo($howMany);
    }

    public function demo(): void
    {
        echo "\nWe start with ", count($this->foo->getElements()), " soldiers in \$foo->elements\n"; 
        $this->removeElement();

        echo "\nWe now have ", count($this->foo->getElements()), " soldiers in \$foo->elements\n"; 
    }

    private function removeElement(): void
    {
        $elements = &$this->foo->getElements();
        array_splice($elements, 2, 1);
    }
}

$init = random_int(4,10);
$demo = new Demo($init);
$demo->demo();

$remaining = count($demo->foo->getElements());

if ($init-1 !== $remaining) {
    throw new UnexpectedValueException('Wrong number of elements, application is broken');
}

Output for 7.4.2, 7.4.6, 7.4.16, 7.4.19, 7.4.22, 8.0.2, 8.0.11: We start with 8 soldiers in $foo->elements We now have 7 soldiers in $foo->elements
Output for 7.4.11, 8.0.9 - 8.0.10: We start with 4 soldiers in $foo->elements We now have 3 soldiers in $foo->elements
Output for 7.4.3, 7.4.5, 7.4.7, 7.4.10, 7.4.23, 8.0.0 - 8.0.1, 8.0.8: We start with 6 soldiers in $foo->elements We now have 5 soldiers in $foo->elements
Output for 7.4.0, 7.4.8 - 7.4.9, 7.4.15, 7.4.18, 8.0.7: We start with 9 soldiers in $foo->elements We now have 8 soldiers in $foo->elements
Output for 8.0.3, 8.0.6: We start with 10 soldiers in $foo->elements We now have 9 soldiers in $foo->elements
Output for 7.4.4, 7.4.21, 7.4.24, 8.0.5: We start with 7 soldiers in $foo->elements We now have 6 soldiers in $foo->elements
Output for 7.4.1, 7.4.12 - 7.4.14, 7.4.20: We start with 5 soldiers in $foo->elements We now have 4 soldiers in $foo->elements
Output for 7.3.0 - 7.3.31: Parse error: syntax error, unexpected 'array' (T_ARRAY), expecting function (T_FUNCTION) or const (T_CONST) in /in/vONXX on line 5
Process exited with code 255.

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