Php/docs/function.iconv-strrpos
iconv_strrpos
(PHP 5, PHP 7)
iconv_strrpos — Finds the last occurrence of a needle within a haystack
说明
iconv_strrpos
( string $haystack
, string $needle
[, string|null $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 ornull
,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
.
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