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Will it make any difference or impact on my result, if I use substr() instead of mb_substr() function?
As my server does not have support for mb_ functions, I have to replace it with substr()
It will impact your script if you work with multi-byte text that you substring from. If this is the case, I higly recommend enabling mb_* functions in your php.ini or do this
ini_set("mbstring.func_overload", 2);