PHP用连字符比较字符串

Question

I need to compare 2 strings without replacing anything.

$str1 = 'short-eared owl';
$str2 = 'short-eared owl';

if (strcmp($str1, $str2)===0) { do this and that …}

The problem here is the hyphen. Even both strings are equal, strcmp() does not result in 0 (equal). Why ?

How to compare those strings correct ?

UPDATE

Here is the essential piece of code

<?php
    $cat=$_GET["cat"];

    if (($handle = fopen($csvFile, "r")) !== FALSE) {
        $dataArray = fgetcsv($handle, 1000, ";"); 
        while (($dataArray = fgetcsv($handle, 1000, ";")) !== FALSE) {
            for ($i=0; $i < 4 ; $i++) {
                if (strcmp($cat,$dataArray[$i])===0 ) {
                // do this and that
                }
            }
        }
        fclose($handle);
    }
?>

What I do is comparing $_GET var which is a string like 'short-eared owl' against columns of a cvs file. If I found 'short-eared owl' in that file I return. But strcmp() does not work here because of the hyphen. If I delete the hypen manually for testing purposes strcmp() matches.

UDATE 2

When evaluating the strcmp() function at php site here there is an "Anonymous" User Contribute Note talking about collation . He writes :

In summary, strcmp() does not necessarily use the ASCII code order of each character like in the 'C' locale, but instead parse each string to match language-specific character entities (such as 'ch' in Spanish, or 'dz' in Czech), whose collation order is then compared. When both character entities have the same collation order (such as 'ss' and ' ' in German), they are compared relative to their code by strcmp(), or considered equal by strcasecmp().

If this is the problem with the hyphen char how to solve it ?

Answer 1

the code you wrote works fine i checked it myself like

$str1 = 'short-eared owl';
$str2 = 'short-eared owl';

if (strcmp($str1, $str2)===0) { 
    echo "success";

} else{
    echo 'fail';
}