Module: PHP

Defined in:
lib/php_serialize.rb

Overview

PHP serialize() and unserialize() workalikes

Release History:

1.0.0 - 2003-06-02 - First release.
1.0.1 - 2003-06-16 - Minor bugfixes.
1.0.2 - 2004-09-17 - Switch all {}'s to explicit Hash.new's.
1.1.0 - 2009-04-01 - Pass assoc to recursive calls (thanks to Edward Speyer).
                   - Serialize Symbol like String.
                   - Add testsuite.
                   - Instantiate auto-generated Structs properly (thanks
                     to Philip Hallstrom).
                   - Unserialize arrays properly in assoc mode.
                   - Add PHP session support (thanks to TJ Vanderpoel).
                   - Release as tarball and gem.

See www.php.net/serialize and www.php.net/unserialize for details on the PHP side of all this.

Defined Under Namespace

Classes: StringIOReader

Class Method Summary collapse

Class Method Details

.serialize(var, assoc = false) ⇒ Object

string = PHP.serialize(mixed var[, bool assoc])

Returns a string representing the argument in a form PHP.unserialize and PHP’s unserialize() should both be able to load.

Array, Hash, Fixnum, Float, True/FalseClass, NilClass, String and Struct are supported; as are objects which support the to_assoc method, which returns an array of the form [[‘attr_name’, ‘value’]..]. Anything else will raise a TypeError.

If ‘assoc’ is specified, Array’s who’s first element is a two value array will be assumed to be an associative array, and will be serialized as a PHP associative array rather than a multidimensional array.



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# File 'lib/php_serialize.rb', line 67

def PHP.serialize(var, assoc = false) # {{{
	s = ''
	case var
		when Array
			s << "a:#{var.size}:{"
			if assoc and var.first.is_a?(Array) and var.first.size == 2
				var.each { |k,v|
					s << PHP.serialize(k, assoc) << PHP.serialize(v, assoc)
				}
			else
				var.each_with_index { |v,i|
					s << "i:#{i};#{PHP.serialize(v, assoc)}"
				}
			end

			s << '}'

		when Hash
			s << "a:#{var.size}:{"
			var.each do |k,v|
				s << "#{PHP.serialize(k, assoc)}#{PHP.serialize(v, assoc)}"
			end
			s << '}'

		when Struct
			# encode as Object with same name
			s << "O:#{var.class.to_s.length}:\"#{var.class.to_s.downcase}\":#{var.members.length}:{"
			var.members.each do |member|
				s << "#{PHP.serialize(member, assoc)}#{PHP.serialize(var[member], assoc)}"
			end
			s << '}'

		when String, Symbol
			s << "s:#{var.to_s.bytesize}:\"#{var.to_s}\";"

		when Fixnum # PHP doesn't have bignums
			s << "i:#{var};"

		when Float
			s << "d:#{var};"

		when NilClass
			s << 'N;'

		when FalseClass, TrueClass
			s << "b:#{var ? 1 :0};"

		else
			if var.respond_to?(:to_assoc)
				v = var.to_assoc
				# encode as Object with same name
				s << "O:#{var.class.to_s.length}:\"#{var.class.to_s.downcase}\":#{v.length}:{"
				v.each do |k,v|
					s << "#{PHP.serialize(k.to_s, assoc)}#{PHP.serialize(v, assoc)}"
				end
				s << '}'
			else
				raise TypeError, "Unable to serialize type #{var.class}"
			end
	end

	s
end

.serialize_session(var, assoc = false) ⇒ Object

string = PHP.serialize_session(mixed var[, bool assoc])

Like PHP.serialize, but only accepts a Hash or associative Array as the root type. The results are returned in PHP session format.



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# File 'lib/php_serialize.rb', line 135

def PHP.serialize_session(var, assoc = false) # {{{
	s = ''
	case var
	when Hash
		var.each do |key,value|
			if key.to_s =~ /\|/
				raise IndexError, "Top level names may not contain pipes"
			end
			s << "#{key}|#{PHP.serialize(value, assoc)}"
		end
	when Array
		var.each do |x|
			case x
			when Array
				if x.size == 2
					s << "#{x[0]}|#{PHP.serialize(x[1])}"
				else
					raise TypeError, "Array is not associative"
				end
			end
		end
	else
		raise TypeError, "Unable to serialize sessions with top level types other than Hash and associative Array"
	end
	s
end

.unserialize(string, classmap = nil, assoc = false) ⇒ Object

mixed = PHP.unserialize(string serialized, [hash classmap, [bool assoc]])

Returns an object containing the reconstituted data from serialized.

If a PHP array (associative; like an ordered hash) is encountered, it scans the keys; if they’re all incrementing integers counting from 0, it’s unserialized as an Array, otherwise it’s unserialized as a Hash. Note: this will lose ordering. To avoid this, specify assoc=true, and it will be unserialized as an associative array: [[key,value],…]

If a serialized object is encountered, the hash ‘classmap’ is searched for the class name (as a symbol). Since PHP classnames are not case-preserving, this must be a .capitalize()d representation. The value is expected to be the class itself; i.e. something you could call .new on.

If it’s not found in ‘classmap’, the current constant namespace is searched, and failing that, a new Struct(classname) is generated, with the arguments for .new specified in the same order PHP provided; since PHP uses hashes to represent attributes, this should be the same order they’re specified in PHP, but this is untested.

each serialized attribute is sent to the new object using the respective attribute=() method; you’ll get a NameError if the method doesn’t exist.

Array, Hash, Fixnum, Float, True/FalseClass, NilClass and String should be returned identically (i.e. foo == PHP.unserialize(PHP.serialize(foo)) for these types); Struct should be too, provided it’s in the namespace Module.const_get within unserialize() can see, or you gave it the same name in the Struct.new(<structname>), otherwise you should provide it in classmap.

Note: StringIO is required for unserialize(); it’s loaded as needed



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# File 'lib/php_serialize.rb', line 194

def PHP.unserialize(string, classmap = nil, assoc = false) # {{{
	if classmap == true or classmap == false
		assoc = classmap
		classmap = {}
	end
	classmap ||= {}

	ret = nil
	original_encoding = string.encoding if string.respond_to?(:encoding)
	string = StringIOReader.new(string.respond_to?(:force_encoding) ? string.force_encoding('BINARY') : string)
	while string.string[string.pos, 32] =~ /^(\w+)\|/ # session_name|serialized_data
		ret ||= {}
		string.pos += $&.size
		ret[$1] = PHP.do_unserialize(string, classmap, assoc, original_encoding)
	end

	ret ? ret : PHP.do_unserialize(string, classmap, assoc, original_encoding)
end