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This document uses PHP Chinese website manual Release
(PHP 4, PHP 5, PHP 7)
rewind — 倒回文件指针的位置
$handle
)
将 handle
的文件位置指针设为文件流的开头。
Note:
如果将文件以附加("a" 或者 "a+")模式打开,写入文件的任何数据总是会被附加在后面,不管文件指针的位置。
handle
文件指针必须合法,并且指向由 fopen() 成功打开的文件。
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
Example #1 rewind() overwriting example
<?php
$handle = fopen ( 'output.txt' , 'r+' );
fwrite ( $handle , 'Really long sentence.' );
rewind ( $handle );
fwrite ( $handle , 'Foo' );
rewind ( $handle );
echo fread ( $handle , filesize ( 'output.txt' ));
fclose ( $handle );
?>
以上例程的输出类似于:
Foolly long sentence.
[#1] MagicalTux at kinoko dot fr [2007-11-26 22:53:04]
Note that rewind($fd) is exactly the same as fseek($fd, 0, SEEK_SET)
rewind() just moves the location inside the file to the beginning, nothing more. Check if your stream is "seekable" before planning to use fseek/rewind.