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 — Comparación de string segura a nivel binario e insensible a mayúsculas y minúsculas
Descripción
int strcasecmp
( string
$str1
, string $str2
)Comparación de string segura a nivel binario e insensible a mayúsculas y minúsculas.
Parámetros
-
str1 -
El primer string
-
str2 -
El segundo string
Valores devueltos
Devuelve < 0 si str1 es menor que
str2; > 0 si str1
es mayor que str2 y 0 si son
iguales.
Ejemplos
Ejemplo #1 Ejemplo de strcasecmp()
<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
echo '$var1 is equal to $var2 in a case-insensitive string comparison';
}
?>
Ver también
- strcmp() - Comparación de string segura a nivel binario
- preg_match() - Realiza una comparación con una expresión regular
- substr_compare() - Comparación segura a nivel binario de dos o más strings desde un desplazamiento, hasta una longitud de caracteres
- strncasecmp() - Comparación de los primeros n caracteres de cadenas, segura con material binario e insensible a mayúsculas y minúsculas
- stristr() - strstr insensible a mayúsculas y minúsculas
- substr() - Devuelve parte de una cadena
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User Contributed Notes
strcasecmp
chris at cmbuckley dot co dot uk
28-Dec-2011 09:59
alvaro at demogracia dot com
28-Jul-2010 11:35
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 12:53
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!