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fread ( resource $handle , int $length ) : string

fread() ��ļ�ָ�� handle ��ȡ�� length ��ֽڡ� �ú��¼��ʱֹͣ��ȡ�ļ��

��ȡ�� length ��ֽ�
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a packet becomes available or the socket timeout occurs (for network streams)
if the stream is read buffered and it does not represent a plain file, at most one read of up to a number of bytes equal to the chunk size (usually 8192) is made; depending on the previously buffered data, the size of the returned data may be larger than the chunk size.

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handle: �ļ�ϵͳָ�룬�ǵ��͵�� fopen() �� resource(��Դ)��
length: ��ȡ length ��ֽڡ�

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Example #1 һ��򵥵� fread() ��


<?php
// get contents of a file into a string
$filename = "/usr/local/something.txt";
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));
fclose($handle);
?>

Example #2 Binary fread() example

Warning

��ֶ��ļ��ı��ļ��ϵͳ�ϣ�� Windows��ļ�ʱ��fopen() �� mode ��Ҫ�� 'b'��


<?php
$filename = "c:\\files\\somepic.gif";
$handle = fopen($filename, "rb");
$contents = fread($handle, filesize($filename));
fclose($handle);
?>

Example #3 Remote fread() examples

Warning

��κβ��ͨ��ļ��ȡʱ��ڶ�ȡ��Զ��ļ�� popen() �Լ� fsockopen() ��ص��ʱ��ȡ��һ��֮��ֹͣ��ζ��Ӧ��ʾ��ռ��ϲ��ɴ�顣


<?php
// �� PHP 5 �����߰汾
$handle = fopen("http://www.example.com/", "rb");
$contents = stream_get_contents($handle);
fclose($handle);
?>


<?php
$handle = fopen("http://www.example.com/", "rb");
$contents = '';
while (!feof($handle)) {
  $contents .= fread($handle, 8192);
}
fclose($handle);
?>

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Note:
��ֻ��뽫һ��ļ��ݶ��뵽һ��ַ��У�� file_get_contents()��ܱ��Ĵ��õöࡣ

Note:
Note that fread() reads from the current position of the file pointer. Use ftell() to find the current position of the pointer and rewind() to rewind the pointer position.

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fwrite() - д��ļ��ɰ�ȫ��ڶ��ļ��
fopen() - ��ļ�� URL
fsockopen() - ��һ��ӻ��һ��Unix�׽��
popen() - �򿪽��ļ�ָ��
fgets() - ��ļ�ָ��ж�ȡһ��
fgetss() - ��ļ�ָ��ж�ȡһ�в��˵� HTML ��
fscanf() - ��ļ��и�ʽ��
file() - ��ļ��һ��
fpassthru() - ��ļ�ָ�봦��ʣ��
ftell() - ��ļ�ָ��/д��λ��
rewind() - ��ļ�ָ��λ��

fread

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