(PHP 5, PHP 7, PHP 8)
iconv_strpos — Finds position of first occurrence of a needle within a haystack
$haystack,$needle,$offset = 0,$encoding = null
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.
haystackThe entire string.
needleThe 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 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.
Returns the numeric position of the first occurrence of
needle in haystack.
If needle is not found,
iconv_strpos() will return false.
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(qǐng)閱讀 布爾類型章節(jié)以獲取更多信息。應(yīng)使用
===
運(yùn)算符來測試此函數(shù)的返回值。
| 版本 | 說明 |
|---|---|
| 8.0.0 |
encoding is nullable now.
|
| 7.1.0 |
Support for negative offsets has been added.
|