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.
Program 1:
PHP
<?php // PHP program to illustrate the working of strncmp() $str1 = "Welcome to GFG"; $str2 = "Welcome to neveropen"; $str3 = "Welcome"; // In this case both the strings are equal print_r(strncmp($str1, $str3, 7)); echo "\n"; // In this case the first is greater print_r(strncmp($str2, $str1, 14)); echo "\n"; // In this case the second is greater print_r(strncmp($str3, $str2, 10)) ?> |
Output:
0 31 -3
Program 2:
PHP
<?php // PHP program to illustrate the working of strncmp() $str1 = "neveropen"; $str2 = "neveropen"; // In this case both the strings are equal print_r(strncmp($str1, $str2, 13)); ?> |
Output:
-32
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