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<?php declare(strict_types=0); function acceptBool(bool $x) {} function acceptInt(int $x) {} function acceptFloat(float $x) {} function acceptString(string $x) {} function acceptArray(array $x) {} function acceptObject(object $x) {} $functions = [ "bool" => "acceptBool", "int" => "acceptInt", "float" => "acceptFloat", "string" => "acceptString", "array" => "acceptArray", "object" => "acceptObject", ]; $vars = [ "null" => null, "bool" => true, "int" => 1, "float" => 3.14, "numeric string" => "2.72", "non-numeric string" => "elephphant", "array" => [1, 2, 3], "object" => new stdClass(), ]; foreach ($vars as $passedType => $var) { foreach ($functions as $acceptedType => $function) { if ($passedType === $acceptedType) { continue; } echo str_pad($passedType, 18) . " -> " . str_pad($acceptedType, 10) . ": "; try { $function($var); echo "success"; } catch(TypeError $e) { echo "failure"; } echo "\n"; } }