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PHP | strncmp() Function

PHP strncmp() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP strncmp() Function.

The built-in php strncmp() function is used to compare first n character. This function is similar to the PHP strcmp(), except that strcmp() function does not have the length parameter.

Note: This PHP function is binary-safe and case-sensitive.


Following below is the syntax to use this function -

int strncmp ( string $str1 , string $str2 , int $len )

Parameter Details

Sr.NoParameters & Description


It specifies first string to search



It specifies second string to search



It specifies number of characters from each string to be used in the comparison

Return Value

This PHP function returns less < 0 if string1 is less than string2, > 0 if string1 is greater than string2, and 0 if they are equal.


Try out the example below -

   echo strncmp("input","input",6);
   echo "<br>";
   echo strncmp("input","iMPut",6);


When the above code is executed, it will produce the following result -


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will be studying about the PHP strpbrk() Function.

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