PHP strncmp() Function

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Compare two strings (case-sensitive):

echo strncmp("Hello world!","Hello earth!",6);

Run example »

Definition and Usage

The strncmp() function compares two strings.

Note: The strncmp() is binary-safe and case-sensitive.

Tip: This function is similar to the strcmp() function, except that strcmp() does not have the length parameter.



Parameter Description
string1 Required. Specifies the first string to compare
string2 Required. Specifies the second string to compare
length Required. Specify the number of characters from each string to be used in the comparison

Technical Details

Return Value: This function returns:
  • 0 - if the two strings are equal
  • <0 - if string1 is less than string2
  • >0 - if string1 is greater than string2
PHP Version: 4+

More Examples

Example 1

Compare two strings (case-sensitive = Hello and hELLo will not output the same):

echo strncmp("Hello","Hello",6);
echo "<br>";
echo strncmp("Hello","hELLo",6);

Run example »

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