PHP fread function and fread function usage_PHP tutorial-PHP Tutorial-php.cn

PHP fread function and fread function usage_PHP tutorial

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Release： 2016-07-20 11:01:16

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PHP fread function and fread function usage

php tutorial fread function and fread function usage
/*
fread syntax:
string fread ( resource $handle , int $length )

The byte length read by fread() is processed by the file pointer referenced. Read as soon as possible on pairs that meet one of the following conditions:

Length of bytes read
!eof (end of file) reached
A package of available networks (streams)
8192 bytes read (userspace stream after opening)

//fread file reading example 1

$filename = "/www.bkjia.com/local/something.txt";
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));
fclose($handle);

//php5 and above versions read the content of the remote server

$handle = fopen("http://www.bkjia.com/", "rb");
$contents = stream_get_contents($handle);
fclose($handle);

$handle = fopen("http://down.php100.com/", "rb");
$contents = '';
while (!feof($handle)) {
$contents .= fread($handle, 8192);
}
fclose($handle);

/*
Sometimes the purpose of the stream is not marked with eof nor a fixed flag, that's why this loop takes forever. This caused me a lot of trouble...
I solved it using stream_get_meta_data function with a break statement as shown below:

$fp = fsockopen("mb.php100.com", 80);
if (!$fp) {
echo "$errstr ($errno)
n";
} else {
fwrite($fp, "data sent by socket");
$content = "";
While (!feof($fp)) {
$content .= fread($fp, 1024);
$stream_meta_data = stream_get_meta_data($fp); //added line
If($stream_meta_data['unread_bytes'] <= 0) break; //added line
}
fclose($fp);
echo $content;
}