# iconv_strpos

(PHP 5, PHP 7)

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

### 说明

iconv_strpos ( string `$haystack` , string `$needle` [, int `$offset` = 0 [, string `$charset` = ini_get("iconv.internal_encoding") ]] ) : int

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. If the offset is negative, it is counted from the end of the string.

`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`.

Warning

此函数可能返回布尔值 `FALSE`，但也可能返回等同于 `FALSE` 的非布尔值。请阅读 布尔类型章节以获取更多信息。应使用 === 运算符来测试此函数的返回值。

### 更新日志

版本 | 说明
--- | ---
7.1.0 | Support for negative `offset`s has been added.

### 参见

- strpos() - 查找字符串首次出现的位置
- iconv_strrpos() - Finds the last occurrence of a needle within a haystack
- mb_strpos() - 查找字符串在另一个字符串中首次出现的位置