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Use of & with () of function

LPH

Well-known member
#1
Hi,

I'm looking at a function within a plugin and there is an & prior to the $.

PHP:
function function_name(&$classObj ....
What does the & do? Is there a link for more information? I've been googling ... :(

Update: I couldn't figure out if this was a typo or had a purpose. I removed the & and the plugin appears to still be working.