[PHP] Pass by references

[Mike Mapsnac]

I write some small program that uses xml. So I will use this function 
http://us3.php.net/manual/en/function.xml-parse-into-struct.php.

Quote: "This function parses an XML file into 2 parallel array structures, 
one (index) containing pointers to the location of the appropriate values in 
the values array. These last two parameters must be passed by reference".

What does it mean pass by reference in PHP?

Thanks

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