File::read()
File::read() – read bytes from a file
Synopsis
require_once 'File.php';
mixed File::read (
string $filename
,
int $size = FILE_DEFAULT_READSIZE
,
mixed $lock
= false
)
Описание
File::read() reads a specific amount of bytes from a specified file and returns them to the user.
Parameter
-
string $filename- the file to read from -
int $size- the number of bytes to read from the file (defaults to FILE_DEFAULT_READSIZE) -
mixed $lock- lock type to use, FALSE if none
Return value
mixed - this function returns the requested bytes
from the file if there were no errors, FALSE if it reached EOF or
a PEAR_Error object if an error has occured during reading from file.
Throws
| Error Code | Error Value | Meaning | Solution |
|---|---|---|---|
| NULL | "File does not exist: $filename" |
The file $filename does not exist. |
Check if the path that is passed to the function is correct. |
| NULL | "Failed to open file: $filename" |
There are few possible things that might cause that error, usually it's caused by wrong permissions or bad sectors on the harddisk. | Check the permissions of the file (ls -l {file} on UNIX systems) and change them so the file is readable by PHP, check if the harddisk is working properly and has no bad sectors. |
Замечание
This function can be called statically.
Пример
Using File::read()
<?php
require_once 'File.php';
//output 40 bytes of file foo.bar
echo File::read("/path/to/foo.bar", 40);
?>