Python中使用django form表单验证的方法
315
2024-01-17
(PHP 5)
iconv_strpos — Finds position of first occurrence of a needle within a haystack
说明
int iconv_strpos ( string$haystack
, string $needle
[, int $offset = 0
[, string $charset = ini_get("iconv.internal_encoding")
]] )
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.
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.
此函数可能返回布尔值
FALSE，但也可能返回等同于 FALSE 的非布尔值。请阅读 布尔类型章节以获取更多信息。应使用
===
运算符来测试此函数的返回值。
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
