iconv_strpos
(PHP 5, PHP 7)
iconv_strpos — Finds position of first occurrence of a needle within a haystack
说明
$haystack
,
string $needle
[,
int $offset
= 0 [,
string $charset
= ini_get("iconv.internal_encoding") ]] ) :
int
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 charset
.
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. -
charset
-
If
charset
parameter is omitted,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 |
---|---|
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