Since I was not finding any proper solution in the internet on how to map all UTF8-strings to their lowercase counterpart in PHP, I offer the following hard-coded extended mb_strtolower function for UTF-8 strings: , ⅿ (UTF-8 code points 8560 through 8575) and should, in my opinion, also be converted by mb_strtolower, but they are not!īig internet-companies (like Google) do match both variants as semantically equal (since the representations only differ in case). , Ⅿ (UTF-8 code points 8544 through 8559) also exist in their respective lower case variants ⅰ, ⅱ, ⅲ. These characters will not be converted be mb_strtolower! However, there are also letters such as "Letter numbers" (Unicode property "Nl") that also have lower case and upper case variants.
Please, note that when using with UTF-8 mb_strtolower will only convert upper case characters to lower case which are marked with the Unicode property "Upper case letter" ("Lu").
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