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(PHP 5, PHP 7)
iconv_strrpos — Finds the last occurrence of a needle within a haystack
$haystack 
   ,  string $needle 
   [,  string $charset  = ini_get("iconv.internal_encoding") 
  ] )
   Finds the last occurrence of a needle
   within a haystack.
  
   In contrast to  strrpos() , the return value of
    iconv_strrpos()  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.
  
haystack The entire string.
needle The searched substring.
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.
  
   Returns the numeric position of the last occurrence of
   needle in haystack.
  
   If needle is not found,
    iconv_strrpos()  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。