Php/docs/function.iconv-strpos
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|null $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 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 first occurrence of
needle
in haystack
.
If needle
is not found,
iconv_strpos() will return false
.
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