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

• Main PHP Function Online page
• strcasecmp() - Binary safe case-insensitive string comparison
• preg_match() - Perform a regular expression match
• substr_compare() - Binary safe comparison of two strings from an offset, up to length characters
• strncmp() - Binary safe string comparison of the first n characters
• strstr() - Find the first occurrence of a string
• substr() - Return part of a string