lecture 10.pptx

PHP File Handling
The fopen() function is used to open files in PHP.
Opening a File
The fopen() function is used to open files in PHP.
The first parameter of this function contains the name of the
file to be opened and the second parameter specifies in
which mode the file should be opened:
<html>
<body>
<?php
$file=fopen("welcome.txt","r");
?>
</body>
</html>

The file may be opened in one of the
following modes:
Modes Description
r Read only. Starts at the beginning of the file
r+ Read/Write. Starts at the beginning of the file
w Write only. Opens and clears the contents of file; or creates a
new file if it doesn't exist
w+ Read/Write. Opens and clears the contents of file; or creates a
a Append. Opens and writes to the end of the file or creates a
a+ Read/Append. Preserves file content by writing to the end of
the file
X Write only. Creates a new file. Returns FALSE and an error if
file already exists
x+ Read/Write. Creates a new file. Returns FALSE and an error if
file already exists
Note: If the fopen() function is unable to open the specified file, it returns 0
(false).

Example
The following example generates a message if the
fopen() function is unable to open the specified file:
<html>
<body>
<?php
$file=fopen("welcome.txt","r") or exit("Unable to open
file!");
?>
</body>
</html>

Closing a File
The fclose() function is used to close an open file:
<?php
$file = fopen("test.txt","r");
//some code to be executed
fclose($file);
?>

Check End-of-file
The feof() function checks if the "end-of-file" (EOF)
has been reached.
The feof() function is useful for looping through
data of unknown length.
Note: You cannot read from files opened in w, a,
and x mode!
if (feof($file)) echo "End of file";

Reading a File Line by Line
The fgets() function is used to read a single line from a file.
Note: After a call to this function the file pointer has moved to
the next line.
Example
The example below reads a file line by line, until the end of
file is reached:
<?php
$file = fopen("welcome.txt", "r") or exit("Unable to open
file!");
//Output a line of the file until the end is reached
while(!feof($file))
{
echo fgets($file). "<br />";
}
fclose($file);
?>

Reading a File Character by
Character
The fgetc() function is used to read a single character
from a file.
Note: After a call to this function the file pointer moves
to the next character.
Example
The example below reads a file character by character,
until the end of file is reached:
<?php
$file=fopen("welcome.txt","r") or exit("Unable to open
file!");
while (!feof($file))
{
echo fgetc($file);
}
fclose($file);
?>

lecture 10.pptx

More Related Content

Similar to lecture 10.pptx (20)

More from ITNet (20)

Recently uploaded (20)

lecture 10.pptx