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<?php class Out extends Exception { private $value; function __construct($value) { $this->value = $value; } function getValue() { return $this->value; } } function out($value) { throw new Out($value); } function mul($x, $y) { try { return ($x ?? out(NULL)) * ($y ?? out(NULL)); } catch (Out $out) { return $out->getValue(); } } var_export(mul(3, 4)); print "\n"; var_export(mul(3, NULL)); print "\n"; var_export(mul(NULL, 4)); print "\n";
Output for git.master, git.master_jit, rfc.property-hooks
12 NULL NULL

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