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Overloading function in php

We can not have two functions with the same name in php 5, but we can simulate this behaviour with the default parameter:
function some_function($one_arg, $sec_arg = "some value that never can appear")
{
if($sec_arg == "some value that never can appear")
	{//some code, for example:	 some_function($one_arg,$one_arg);
	}
else
	//another code
} 
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