Innovation Award
April 2008
Number 3 |
Serializing a variable value is a way to convert any type of variable into a single string that can be stored in a file, a database or sent to another application or another server, in a way that the original variable value can be easily restored.
One easy way convert the value of any variable into a single human-readable string is to use the PHP var_export function. To unserialize a value serialized this way, PHP applications only need to use the eval function.
However, applications must be careful when using the eval function to unserialize values received from untrusted sources. The problem is that serialized values may contain arbitrary PHP code that may allow security abuses that is executed when eval is called.
This class provides a secure solution to unserialized values serialized with var_export. It uses the PHP tokenizer extension to evaluate the serialized value. This way any kind of disallowed type of expression is detected by the class.
Manuel Lemos |
This class can be used to securely unserialize values exported with PHP var_export function.
var_export is a PHP function that can be used to export variable values as text string.
The exported data can be used as an alternative to XML or JSON to pass complex data values between the same or different computers. Thus the name PHP Object Notation: PHON (pronounced like font but silencing the ending "t" sound).
This class can use the eval function to unserialize and restore the original values exported with var_export.
Alternatively, it can also parse the expression and unserialize it securely by disallowing non-constant expressions in the exported values that could be used to run dangerous arbitrary PHP code.
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