PHP: strcasecmp - Manual

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Last updated: Sat, 27 Jan 2007

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# 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().

add a note User Contributed Notes
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!`
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Last updated: Sat, 27 Jan 2007
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