Online PHP editor | output for 7lUI0M

@ 2020-12-05T21:00:46Z

<?php

class Maybe {
    
    private function __construct(private mixed $value = null) {}
    
    public static function Some(mixed $v): static {
        return new static($v);
    }
    
    public function value(): mixed {
        return null === $this->value
            ? throw new Exception()
            : $this->value;
    }
    
    public function __invoke(callable $c): static {
        return null===$this->value
            ? $this
            : static::Some($c($this->value));
    }
}

function double($x) {
    return $x * 2;
}


$res =  Maybe::Some(30)
  (double::class)
  (chr::class)
  (fn($x) => strlen($x));

var_dump($res->value());

Output for 8.0.0, 8.1.23 - 8.1.28, 8.2.10 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: int(1)
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 int(1)
Output for 7.3.0 - 7.3.25, 7.4.0 - 7.4.13: Parse error: syntax error, unexpected 'private' (T_PRIVATE), expecting variable (T_VARIABLE) in /in/7lUI0M on line 5
Process exited with code 255.

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