iconv_strpos
(PHP 5, PHP 7, PHP 8)
iconv_strpos — Finds position of first occurrence of a needle within a haystack
說明
string
$haystack,string
$needle,int
$offset = 0,?string
$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.
參數
-
haystack -
The entire string.
-
needle -
The searched substring.
-
offset -
The optional
offsetparameter 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
encodingparameter is omitted ornull,stringare 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.
更新日誌
| 版本 | 說明 |
|---|---|
| 8.0.0 |
encoding is nullable now.
|
| 7.1.0 |
Support for negative offsets has been added.
|
參見
- strpos() - 查詢字串首次出現的位置
- iconv_strrpos() - Finds the last occurrence of a needle within a haystack
- mb_strpos() - 查詢字串在另一個字串中首次出現的位置