iconv_strrpos

(PHP 5, PHP 7, PHP 8)

iconv_strrpos — Finds the last occurrence of a needle within a haystack

说明

iconv_strrpos(string $haystack, string $needle, ?string $encoding = null): int|false

Finds the last occurrence of a needle within a haystack.

In contrast to strrpos(), the return value of iconv_strrpos() 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.
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 last occurrence of needle in haystack.

If needle is not found, iconv_strrpos() 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.

参见

strrpos() - 计算指定字符串在目标字符串中最后一次出现的位置
iconv_strpos() - Finds position of first occurrence of a needle within a haystack
mb_strrpos() - 查找字符串在一个字符串中最后出现的位置

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