Testing re-serializing data in PHP that contains classes

1_write.php

<?php

include 'ExampleClass1.php';
include 'ExampleClass2.php';

$object = new stdClass;
$object->foo = 'bar';

$class1 = new ExampleClass1();
$class2 = new ExampleClass2();

$data = [
	'int'    => 123,
	'string' => 'foo',
	'bool'   => true,
	'array'  => ['foo' => 'bar'],
	'object' => $object,
	'class1' => $class1,
	'class2' => $class2,
];

$serialized = serialize($data);

file_put_contents('serialized1.txt', $serialized);

2_replace.php

<?php

include 'PlaceholderClass.php';

$serialized = file_get_contents('serialized1.txt');

// Find classes in serialized string
$classNames = [];
preg_match_all('/O:\d+:\"(.*?)\"/', $serialized, $matches);
if (isset($matches[1]) && !empty($matches[1])) {
	foreach ($matches[1] as $className) {
		if ($className == 'stdClass') {
			continue;
		}

		$classNames[] = $className;
	}
}

print_r($classNames);

// Use this instead of class_alias
foreach ($classNames as $className) {
	// http://stackoverflow.com/questions/9229605/in-php-how-do-you-get-the-called-aliased-class-when-using-class-alias
	eval('class ' . $className . ' extends PlaceholderClass {}');
}

$unserialized = unserialize($serialized);

// Update the object properties for ExampleClass1
$class1Props = get_object_vars($unserialized['class1']);
foreach ($class1Props as $key => $value) {
	if (property_exists($unserialized['class1'], $key)) {
		$unserialized['class1']->{$key} = $value . ' EDITED';
	}
}

print_r($unserialized);
echo "\n";

$reserialized = serialize($unserialized);

file_put_contents('serialized2.txt', $reserialized);

3_read.php

<?php

include 'ExampleClass1.php';
include 'ExampleClass2.php';

$serialized = file_get_contents('serialized2.txt');
print_r(unserialize($serialized));

4_output.txt

Array
(
    [int] => 123
    [string] => foo
    [bool] => 1
    [array] => Array
        (
            [foo] => bar
        )

    [object] => stdClass Object
        (
            [foo] => bar
        )

    [class1] => ExampleClass1 Object
        (
            [privateVar:ExampleClass1:private] => private variable
            [protectedVar:protected] => protected variable
            [publicVar] => public variable EDITED
        )

    [class2] => ExampleClass2 Object
        (
            [privateVar:ExampleClass2:private] => private variable
            [protectedVar:protected] => protected variable
            [publicVar] => public variable
        )

)