Pinq\Tests\Integration\Providers\DSL\ParameterHasherTest::testFunctionSignatureHasher PHP Method

    public function testFunctionSignatureHasher()
    {
        $hasher = ParameterHasher::functionSignature();
        foreach (['strlen', function () {
        }, [$this, 'getName'], [$this, 'testFunctionSignatureHasher'], __NAMESPACE__ . '\\userDefinedFunction', [__CLASS__, 'staticFunction']] as $function) {
            $this->assertSame($hasher->hash($function), $hasher->hash($function));
        }
        //Indistinguishable signatures:
        $this->assertSame($hasher->hash(function () {
        }), $hasher->hash(function () {
        }));
        $this->assertSame($hasher->hash(function (\stdClass $foo = null) {
        }), $hasher->hash(function (\stdClass $foo = null) {
        }));
        //Case insensitive functions:
        $this->assertSame($hasher->hash('StrLen'), $hasher->hash('strleN'));
        $this->assertNotSame($hasher->hash('strlen'), $hasher->hash('strpos'));
        $this->assertNotSame($hasher->hash('stripos'), $hasher->hash('strpos'));
        $this->assertNotSame($hasher->hash([__CLASS__, 'staticFunction']), $hasher->hash(__NAMESPACE__ . '\\userDefinedFunction'));
        $this->assertNotSame($hasher->hash([__CLASS__, 'staticFunction']), $hasher->hash(__NAMESPACE__ . '\\userDefinedFunction'));
        $this->assertNotSame($hasher->hash(function ($i) {
        }), $hasher->hash(function ($o) {
        }));
        $this->assertNotSame($hasher->hash(function ($i) {
        }), $hasher->hash(function &($i) {
        }));
        $this->assertNotSame($hasher->hash(function ($i) {
        }), $hasher->hash(function (&$i) {
        }));
        $this->assertNotSame($hasher->hash(function ($i) {
        }), $hasher->hash(function ($i, $j) {
        }));
        $this->assertNotSame($hasher->hash(function ($i) {
        }), $hasher->hash(function ($i = null) {
        }));
        //Same signature but distinguishable location
        $this->assertNotSame($hasher->hash(function ($i) {
        }), $hasher->hash(function ($i) {
        }));
    }