PHP: strcasecmp

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

strcasecmp -- Сравнение строк без учета регистра, безопасное для данных в двоичной форме

Описание

int strcasecmp ( string str1, string str2 )

Возвращает отрицательное число, если str1 меньше, чем str2; положительное число, если str1 больше, чем str2, и 0 если строки равны.
Пример 1. Пример использования strcasecmp()

<?php $var1 = "Hello"; $var2 = "hello"; if (strcasecmp($var1, $var2) == 0) { echo '$var1 равно $var2 при сравнении без учета регистра'; } ?>

См. также описание функций ereg(), strcmp(), substr(), stristr(), strncasecmp() и strstr().

strcasecmp

27-Aug-2002 06:53


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!