Description
string fread (int handle, int length)
Fread () reads up to length bytes from the file pointer handle. The function stops reading a file when it reads up to a maximum length of bytes, or when it reaches EOF, or (for a network stream) when a package is available, or (after opening a user-space stream), reads 8,192 bytes, depending on which situation you first encounter.
Returns a string that is read, FALSE if an error is returned.
Copy Code code as follows:
<?php
Get contents's 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 binaries and text files (such as Windows), the mode parameter of the fopen () function is added ' B '.
Copy Code code as follows:
<?php
$filename = "C:\\files\\somepic.gif";
$handle = fopen ($filename, "RB");
$contents = Fread ($handle, FileSize ($filename));
Fclose ($handle);
?>
Warning
When read from any not normal 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 and merged into chunks as shown in the following example.
Copy Code code as follows:
<?php
For PHP 5 and later
$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);
?>
Note: If you just want to read the contents of a file into a string, with file_get_contents (), it is 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 the file into a string. Reads the content of length MaxLen at the location 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. Memory-mapping technology is also used to enhance performance if supported by the operating system.
