strncasecmp

(PHP 4 >= 4.0.2, PHP 5)

strncasecmp — Binary safe case-insensitive string comparison of the first n characters

Opis

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

This function is similar to strcasecmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.

Parametry

str1: The first string.
str2: The second string.
len: The length of strings to be used in the comparison.

Zwracane wartości

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

Zobacz też:

preg_match() - Perform a regular expression match
strcmp() - Binary safe string comparison
strcasecmp() - Binary safe case-insensitive string comparison
substr() - Return part of a string
stristr() - Case-insensitive strstr
strstr() - Find first occurrence of a string

add a note User Contributed Notes
strncasecmp

khootz
28-Nov-2006 04:23


i assume you can also use the ! (not) operator



<?php



if (!strncasecmp($string, 'Trudeau', 4)){

       print "true";

}



?>



since booleans in PHP translate 0 to FALSE and any other integer to TRUE.



!0  = !false = true

!1  = !true = false

!-1 = !true = false

djdykes
31-Aug-2005 10:43


Hi all,



be aware when comparing strings using the strcmp family. if you write code like this... 



if (strncasecmp($string, 'Trudeau', 4))

 print "true";



The above code returns 1 which evaluates to boolean 'true'



that statement will always be true... because these functions return 0 only when equal. so a better test would be



if ( (strncasecmp($string, 'Trudeau', 4)) == 0)

 print "true";



always test these functions equality with 0



regards

add a note

strncmp

strnatcmp

Last updated: Fri, 20 Nov 2009