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if your function accepts arguments passed by reference that you intend to modify, you need to take some precautions.
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in its simpelest form the function will take only the two strings as parameter and will calculate just the number of insert, replace and delete operations needed to transform str1 into str2.
esta función devuelve la distancia levenshtein entre las dos cadenas argumento, ó -1 si alguna de las cadenas tiene más de 255 caracteres.

as soon as this point is reached, it's time to touch the heart of php and take a look at its core, the c code that makes php go.
duplicating variable contents:

a second variant will take three additional parameters that define the cost of insert, replace and delete operations. this is more general and adaptive than variant one, but not as efficient.
la distancia levenshtein se define como el mínimo número de caracteres que se tienen que sustituir, insertar o borrar para transformar cad1 en cad2.