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# stripos

(PHP 5)

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.

Note that the needle may be a string of one or more characters.

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

切記!
這個函數可能回傳布林值 `FALSE`，但也可能回傳一個同於 `FALSE` 的非布林值，像是0或 ""請參考Booleans此節有更多資訊。使用 === 運算子來測試這個函數的回傳值。

示範 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.

> 備注:這個函數可安全的使用於二進位。

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

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