This chapter will explain the following functions related to files:
- Opening a file
- Reading a file
- Writing a file
- Closing a file
Opening and Closing Files
The PHP fopen() function is used to open a file. It requires two arguments stating first the file name and then mode in which to operate.
Files modes can be specified as one of the six options in this table.
Mode Purpose
r : Opens the file for reading only. Places the file pointer at the beginning of the file.
r+ : Opens the file for reading and writing. Places the file pointer at the beginning of the file.
w : Opens the file for writing only. Places the file pointer at the beginning of the file. and truncates the file to zero length If the file does not exist, then it attempts to create a file.
w+ : Opens the file for reading and writing only. Places the file pointer at the beginning of the file. and truncates the file to zero length. If the file does not exist, then it attempts to create a file.
a : Opens the file for writing only. Places the file pointer at the end of the file. If the file does not exist,
then it attempts to create a file.
a+ : Opens the file for reading and writing only. Places the file pointer at the end of the file. If the file does not exist, then it attempts to create a file.
If an attempt to open a file fails, then fopen returns a value of false otherwise it returns a file pointer which is used for further reading or writing to that file.
After making a changes to the opened file it is important to close it with the fclose()function. The fclose() function requires a file pointer as its argument and then returns true when the closure succeeds or false if it fails.
Reading a file
Once a file is opened using fopen() function it can be read with a function called fread(). This function requires two arguments. These must be the file pointer and the length of the file expressed in bytes.
The file's length can be found using the filesize() function which takes the file name as its argument and returns the size of the file expressed in bytes.
So here are the steps required to read a file with PHP.
- Open a file using fopen() function.
- Get the file's length using filesize() function.
- Read the file's content using fread() function.
- Close the file with fclose() function.
The following example assigns the content of a text file to a variable and then displays those contents on the web page.
<html>
<head>
<title>Reading a file using PHP</title>
</head>
<body>
<?php
$filename = "/home/user/guest/tmp.txt";
$file = fopen( $filename, "r" );
if( $file == false )
{
echo ( "Error in opening file" );
exit();
}
$filesize = filesize( $filename );
$filetext = fread( $file, $filesize );
fclose( $file );
echo ( "File size : $filesize bytes" );
echo ( "<pre>$filetext</pre>" );
?>
</body>
</html>
Writing a File
A new file can be written or text can be appended to an existing file using the PHP fwrite()function. This function requires two arguments specifying a file pointer and the string of data that is to be written. Optionally a third integer argument can be included to specify the length of the data to write. If the third argument is included, writing would will stop after the specified length has been reached.
The following example creates a new text file and then writes a short text heading inside it. After closing this file its existence is confirmed using file_exist() function which takes file name as an argument
<?php
$filename = "/home/user/guest/newfile.txt";
$file = fopen( $filename, "w" );
if( $file == false )
{
echo ( "Error in opening new file" );
exit();
}
fwrite( $file, "This is a simple test\n" );
fclose( $file );
?>
<html>
<head>
<title>Writing a file using PHP</title>
</head>
<body>
<?php
if( file_exist( $filename ) )
{
$filesize = filesize( $filename );
$msg = "File created with name $filename ";
$msg .= "containing $filesize bytes";
echo ($msg );
}
else
{
echo ("File $filename does not exit" );
}
?>
</body>
</html>
We have covered all the function related to file input and out in the PHP File System Function chapter.
Anil Bist
Skills Php
Qualifications :- High School - SLV, College/University - Graphic Era Deemed Univ University,Location :-Dehradun,Dehradun,Uttarakhand,India
Description:-
I started my Professional Journey in 2006 with one of the Web Development Company in Bangalore and my 1st framework was "Ruby on Rail" as Web development and delivered around 5+ Projects using this platform. Then came another dimension as JEE/Sturst framework, Gradually I realized that I want to build something on my own and give my passion and energy on creating something different a
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