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strncasecmp

Binary safe case-insensitive string comparison of the first n characters (PHP 4 >= 4.0.2, PHP 5)
int strncasecmp ( string str1, string str2, int len )

This 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.

Parameters

str1

The first string.

str2

The second string.

len

The length of strings to be used in the comparison.

Return Values

Returns < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal.