str_word_count
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!
strcasecmp
(PHP 4, PHP 5)
strcasecmp — Сравнява низове, нечувствително към регистъра и двоично сигурно
Описание
int strcasecmp
( string $str1
, string $str2
)
Нечувствително към регистъра и двоично сигурно сравнение на низове.
Параметри
- str1
-
Първият низ
- str2
-
Вторият низ
Връщани стойности
Връща < 0 ако str1 е по-малък от str2 ; > 0 ако str1 е по-голям от str2 , и 0 ако са равни.
Примери
Example #1 Пример за strcasecmp()
<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
echo '$var1 is equal to $var2 in a case-insensitive string comparison';
}
?>
Вж. също
- preg_match() - Perform a regular expression match
- strcmp() - Двоично сигурно сравняване на низове
- substr() - Връща част от низ
- stristr() - Нечувствителен към регистъра вариант на функция strstr
- strncasecmp() - Сравнява първите n знака на низ, нечувствително към регистъра и двоично сигурно
- strstr() - Връща първата поява на низ
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User Contributed Notes
strcasecmp - [3 notes]
Anonymous ¶
10 years ago
chris at cmbuckley dot co dot uk ¶
1 year ago
A simple multibyte-safe case-insensitive string comparison:
<?php
function mb_strcasecmp($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".
alvaro at demogracia dot com ¶
2 years ago
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.