(PHP 4 >= 4.0.2, PHP 5)
strncasecmp -- Binary safe case-insensitive string comparison of the first n charactersThis function is similar to strcasecmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.
str1
The first string.
str2
The second string.
len
The length of strings to be used in the comparison.