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function main()
{
    function1 hello
    function2 world
}
# If you call the main function here, You will get an error. It hasn't parsed function1 and function2 functions yet
function function1($arg)
{
    echo "function1:$arg"
}

function function2($arg)
{
    echo "function2:$arg"
}

#now all functions are accounted for, so go ahead and call
main