str_word_count
A simple multibyte-safe case-insensitive string comparison:
<?php
function mb_strcasecmp($str1, $str2, $encoding = null) {
if (null === $encoding) { $encoding = mb_internal_encoding(); }
return strcmp(mb_strtoupper($str1, $encoding), mb_strtoupper($str2, $encoding));
}
?>
Caveat: watch out for edge cases like "ß".
strcasecmp
(PHP 4, PHP 5)
strcasecmp — Comparaison insensible à la casse de chaînes binaires
Description
int strcasecmp
( string $str1
, string $str2
)
Comparaison insensible à la casse de chaînes binaires.
Liste de paramètres
- str1
-
La première chaîne.
- str2
-
La seconde chaîne.
Valeurs de retour
Retourne < 0 si str1 est inférieure à str2; > 0 si str1 est plus grande que str2, et 0 si les deux chaînes sont égales.
Exemples
Exemple #1 Exemple avec strcasecmp()
<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
echo '$var1 est égale à $var2 (comparaison insensible à la casse)';
}
?>
Voir aussi
- strcmp() - Comparaison binaire de chaînes
- preg_match() - Expression rationnelle standard
- substr_compare() - Compare deux chaînes depuis un offset jusqu'à une longueur en caractères
- strncasecmp() - Compare en binaire des chaînes de caractères
- stristr() - Version insensible à la casse de strstr
- substr() - Retourne un segment de chaîne
add a note
User Contributed Notes
strcasecmp
chris at cmbuckley dot co dot uk
29-Dec-2011 01:59
alvaro at demogracia dot com
29-Jul-2010 02:35
Don't forget this is a single-byte function: in Unicode strings it'll provide incoherent results as soon as both strings differ only in case. There doesn't seem to exist a built-in multi-byte alternative so you need to write your own, taking into account both character encoding and collation.
27-Aug-2002 03:53
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!