iconv_strpos

(PHP 5, PHP 7, PHP 8)

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 $encoding = null
): int|false

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 encoding.

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.
encoding: If encoding parameter is omitted or null, 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

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
8.0.0	`encoding` is nullable now.
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

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