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 $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.

Warning

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。

更新日志

版本 说明
7.1.0 Support for negative offsets 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

相关文章
php grapheme 函数 find position in grapheme units of first occurrence of a case insensitive stringphp grapheme 函数 returns part of haystack string from the first occurrence of case insensitive needle to the end of haystackphp grapheme 函数 find position in grapheme units of first occurrence of a stringphp grapheme 函数 find position in grapheme units of last occurrence of a case insensitive stringphp grapheme 函数 find position in grapheme units of last occurrence of a stringphp grapheme 函数 returns part of haystack string from the first occurrence of needle to the end of haystackphp iconv 函数 获取 iconv 扩展的内部配置变量php iconv 函数 一次性解码多个 mime 头字段php iconv 函数 解码一个mime头字段php iconv 函数 finds position of first occurrence of a needle within a haystackphp iconv 函数 finds the last occurrence of a needle within a haystackphp ncurses 函数 delete character at current position move rest of line leftphp ncurses 函数 delete line at current position move rest of screen upphp ncurses 函数 move position and delete character shift rest of line leftphp ncurses 函数 draw a vertical line at current position using an attributed character and max. n characters longphp pdf 函数 output text at current positionphp ps 函数 output a text at current positionphp snmp 函数 return all objects including their respective object id within the specified onephp intlbreakiterator set position to the first character in the textphp sdo 函数 move an item to another sequence position
关注编程学问公众号