PHP isn’t strict on the input data in can contain in its variables. You can mix a set of null, boolean, integers, floats, string, unicode strings and binary data – all as a string.
Interestingly, you can do expected mathematical calculations with these strings, eg.
php -r “echo ‘3’+’5′;”
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An image data is a safe string, that you can write to. More of this behavior is described in PHP Type Juggling.