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# iconv_strpos

(PHP 5)

iconv_strpos -- Finds position of first occurrence of a needle within a haystack

## 说明

int iconv_strpos ( string haystack, string needle [, int offset [, string charset]] )

Finds position of first occurrence of a needle within a haystack.

In contrast to strpos(), the return value of iconv_strpos() is the number of characters that appear before the needle, rather than the offset in bytes to the position where the needle has been found. The characters are counted on the basis of the specified character set `charset`.

## 参数

`haystack`

  The entire string.

`needle`

  The searched substring.

`offset`

  The optional `offset` parameter specifies the position from which the search should be performed.

`charset`

  If `charset` parameter is omitted, `string` are assumed to be encoded in iconv.internal_encoding.

If `haystack` or `needle` is not a string, it is converted to a string and applied as the ordinal value of a character.

## 返回值

Returns the numeric position of the first occurrence of `needle` in `haystack`.

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

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。

## 参见

strpos()
iconv_strrpos()
mb_strpos()

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