strcasecmp

(PHP 3 >= 3.0.2, PHP 4, PHP 5)

strcasecmp --  Binary safe case-insensitive string comparison

Description

int strcasecmp ( string str1, string str2 )

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

例子 1. strcasecmp() example

<?php
$var1
= "Hello";
$var2 = "hello";
if (
strcasecmp($var1, $var2) == 0) {
    echo
'$var1 is equal to $var2 in a case-insensitive string comparison';
}
?>

See also ereg(), strcmp(), substr(), stristr(), strncasecmp(), and strstr().


add a note add a note User Contributed Notes
27-Aug-2002 09:53
The sample above is only true on some platforms that only use a simple 'C' locale, where individual bytes are considered as complete characters that are converted to lowercase before being differentiated.

Other locales (see LC_COLLATE and LC_ALL) use the difference of collation order of characters, where characters may be groups of bytes taken from the input strings, or simply return -1, 0, or 1 as the collation order is not simply defined by comparing individual characters but by more complex rules.

Don't base your code on a specific non null value returned by strcmp() or strcasecmp(): it is not portable. Just consider the sign of the result and be sure to use the correct locale!