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# strripos

(PHP 5)

strripos -- Find position of last occurrence of a case-insensitive string in a string

## Description

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

Returns the numeric position of the last occurrence of needle in the haystack string. Unlike strrpos(), strripos() is case-insensitive. Also note that string positions start at 0, and not 1.

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

If needle is not found, `FALSE` is returned.

警告
本函数可能返回布尔值 `FALSE`，但也可能返回一个与 `FALSE` 等值的非布尔值，例如 0 或者 ""。请参阅布尔类型章节以获取更多信息。应使用 === 运算符来测试本函数的返回值。

例子 1. A simple strripos() example

`<?php $haystack = 'ababcd'; $needle = 'aB'; $pos = strripos($haystack, $needle); if ($pos === false) { echo "Sorry, we did not find ($needle) in ($haystack)"; } else { echo "Congratulations!\n"; echo "We found the last ($needle) in ($haystack) at position ($pos)"; } ?>`

Outputs:

    Congratulations!
       We found the last (aB) in (ababcd) at position (2)

The offset parameter may be specified to begin searching an arbitrary number of characters into the string.

Negative offset values will start the search at offset characters from the start of the string.

See also strrpos(), strrchr(), substr(), stripos() and stristr().

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