The strncmp() is an inbuilt function in PHP which is used to compare first n character of two strings. This function is case-sensitive which points that capital and small cases will be treated differently, during comparison. This function compares two strings with first n character and tells whether the first string is greater or smaller or equal to the second string.
int strncmp( $str1, $str2, $len )
Parameters: This function accepts three parameters as mentioned above and described below:
- $str1: It is mandatory parameter. This parameter refers to the first string to be used in the comparison.
- $str2: It is mandatory parameter. This parameter refers to the second string to be used in the comparison.
- $len: It is mandatory parameter which is used to define the first $len number of characters compared.
Return Value: This function returns a random integer value depending on the comparison of string which is given below:
- Returns 0 if the first n character of both strings are equal.
- Returns a negative value ( < 0), if the first n character of $string2 is greater than $string1.
- Returns a positive value ( > 0), if the first n character of $string1 is greater than $string2.
Below programs illustrate the strncmp() function in PHP.
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