foxit reader 2.3 Tips on using php fread

Description
string fread ( int handle, int length )
fread() reads up to length bytes from the file pointer handle. This function is called after reading up to length bytes, or when EOF is reached, or (for network streams) when a packet is available, or (after opening a user space stream) 8192 bytes have been read. Will stop reading the file, depending on which condition is encountered first.
Returns the string read, or FALSE if an error occurs.

Copy the code The code is as follows:

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

Warning
On systems that distinguish between binary files and text files (such as Windows) When opening a file, add 'b' to the mode parameter of the fopen() function.

Copy code The code is as follows:

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

Warning
When reading from any file that is not a normal local file, such as when reading from a remote file or popen( ) and the stream returned by proc_open(), reading stops after a packet is available. This means that the data should be collected and merged into large chunks as shown in the example below.

Copy the code The code is as follows:

// For PHP 5 and above
$handle = fopen("http://www.example.com/", "rb" );
$contents = stream_get_contents($handle);
fclose($handle);
?>
$handle = fopen ("http://www.example.com/", "rb" );
$contents = "";
while (!feof($handle)) {
$contents .= fread($handle, 8192);
}
fclose($handle);
?>

Note : If you just want to read the contents of a file into a string, use file_get_contents(), which has much better performance than the above code.
Extra:
file_get_contents
(PHP 4 >= 4.3.0, PHP 5)
file_get_contents -- Read the entire file into a string
Description
string file_get_contents ( string filename [, bool use_include_path [, resource context [, int offset [, int maxlen]]]] )
Same as file(), except file_get_contents() reads the file into a string. Contents of length maxlen will be read starting at the position specified by the offset parameter. On failure, file_get_contents() returns FALSE.
The file_get_contents() function is the preferred method for reading the contents of a file into a string. If the operating system supports it, memory mapping technology will also be used to enhance performance.

The above introduces foxit reader 2.3's tips on using PHP fread, including the content of foxit reader 2.3. I hope it will be helpful to friends who are interested in PHP tutorials.