Руководство по PHP
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stripos

(no version information, might be only in CVS)

stripos --  Find position of first occurrence of a case-insensitive string

Description

int stripos ( string haystack, string needle [, int offset])

Returns the numeric position of the first occurrence of needle in the haystack string. Unlike strpos(), stripos() is case-insensitive. And unlike strrpos(), this function can take a full string as the needle parameter and the entire string will be used.

If needle is not found, strpos() will return boolean FALSE.

Внимание

Эта функция может возвращать как логическое значение FALSE, так и не относящееся к логическому типу значение, которое может являться значением FALSE, например, 0 или "". За более подробной информации обратитесь к разделу Логические типы. Используйте оператор === для проверки значения, возвращаемого этой функцией.

Пример 1. stripos() examples

<?php
$findme    = 'a';
$mystring1 = 'xyz';
$mystring2 = 'ABC';

$pos1 = stripos($mystring1, $findme);
$pos2 = stripos($mystring2, $findme);

// Nope, 'a' is certainly not in 'xyz'
if ($pos1 === false) {
    echo "The string '$findme' was not found in the string '$mystring1'";
}

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' is the 0th (first) character.
if ($pos2 !== false) {
    echo "We found '$findme' in '$mystring2' at position $pos2";
}
?>

If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

The optional offset parameter allows you to specify which character in haystack to start searching. The position returned is still relative to the the beginning of haystack.

See also strpos(), strrpos(), strrchr(), substr(), stristr(), strstr() and stri_replace().

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