Description
string fread (int handle, int length)
Fread () reads up to length bytes from a file pointer handle. The function stops reading the file when it has read up to the maximum length of bytes, or when it reaches EOF, or (for a network stream) when a package is available, or when 8,192 bytes have been read (after opening a stream of user space), depending on which situation is encountered first.
Returns the read string if an error returns FALSE.
Copy CodeThe 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
When you open a file on a system that distinguishes between binary and text files (such as Windows), the mode parameter of the fopen () function is prefixed with ' B '.
Copy CodeThe 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 non-trivial local file, such as when reading a stream returned from a remote file or Popen () and Proc_open (), the read stops after a package is available. This means that the data should be collected together into chunks as shown in the following example.
Copy CodeThe code is as follows:
For PHP 5 and later
$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, using file_get_contents (), it performs much better than the code above.
Extra:
File_get_contents
(PHP 4 >= 4.3.0, PHP 5)
File_get_contents--Reads the entire file into a string
Description
String file_get_contents (string filename [, bool Use_include_path [, resource context [, int offset [, int maxlen]]])
As with file (), only file_get_contents () reads a file into a string. Reads the contents of length MaxLen at the position specified by the parameter offset. If it fails, 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 operating system support also uses memory-mapping techniques to enhance performance.
http://www.bkjia.com/PHPjc/321192.html www.bkjia.com true http://www.bkjia.com/PHPjc/321192.html techarticle description string fread (int handle, int length) fread () reads up to length bytes from a file pointer handle. The function reads the maximum number of bytes, or reaches EOF ...
