fseek
(PHP 3, PHP 4 >= 4.0.0)fseek -- 定位一个文件的指针描述
int fseek (int fp, int offset [, int whence])
为这个文件的引用fp设置文件指示器。这个新的位置,是从文件开始以字节为标准由offset指定的,或由 whence指定的位置开始。 whence的值见下:
SEEK_SET - 从文件开始;SEEK_CUR - 从当前位置;SEEK_END - 从文件结尾开始。
如果whence 没有指定,默认为 SEEK_SET。
成功,返回0;否则,返回-1。注意定位到结束符 EOF 不是一个错误。
如果使用"http://" or "ftp://"格式的网站建设服务器脚本类\PHPPHP用户手册fancyfunction.fopen.html>fopen() 返回的指针不可以使用本函数。
注意: whence 参数必须在PHP 4.0 RC1以上的版本中使用。
参见 ftell() 和 rewind().

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