php - Levenshtein distance on diacritic characters -

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In PHP, I'm calculating levenshtein () using the levenshtein function. It works as expected for simple characters, but for example, 
  Echo Levenshatin ('A', 'A') for diacritic characters;   
 This gives "2" in this case only one replacement is to be done, so I hope that it will return "1".  
 Am I missing something?  
 
 
 default PHP  levenshtein () , such as many PHP functions, multibyte aware Therefore, when processing wire with Unicode characters, it handles each byte separately and changes two bytes.  
 There is no multibit version (i.e.  mb_levenshtein () ) then you have two options:  
 1)  mb _  Function re-implement the function by using functions:  
    
 2). If you want to calculate levenicity differences especially from Deacritic characters to non-directories, it may not be the same as what you want.

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