iconv_strrpos

(PHP 5, PHP 7, PHP 8)

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

說明

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.

參數(shù)

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

此函數(shù)可能返回布爾值 false，但也可能返回等同于 false 的非布爾值。請閱讀 布爾類型章節(jié)以獲取更多信息。應(yīng)使用 === 運算符來測試此函數(shù)的返回值。

更新日志

版本 說明
8.0.0 encoding is nullable now.

參見

  • strrpos() - 計算指定字符串在目標(biāo)字符串中最后一次出現(xiàn)的位置
  • iconv_strpos() - Finds position of first occurrence of a needle within a haystack
  • mb_strrpos() - 查找字符串在一個字符串中最后出現(xiàn)的位置