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Fatal Error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 262144 bytes) on line 3

I am getting this error in codeigniter 3. I had tried most of the things but none of them worked.

    function money_format($num = 0, $pro = 2)
        %number =round((float)$num, $pro);
         if($pro == 2)
            $num = money_format("%!^2n",(float)$num);
            $num = money_format("%=*!^.".$pro."n",(float)$num);
         return $num;
This is a recursive function without a stop condition. This will lead to an infinite loop. It'll always calls itself until there is no memory left.
If I could suggest an alternative, I would say to use the number_format function to format numbers. Its a native php function and really simple to use. Take a look at the documentation.
        
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