PHP

Working with Files

Perancangan dan Pemrograman Web: PHP (wcw)

Opening a File

• fopen (path_to_file, file_mode)

File Modes

File Mode

Description

r open for reading

w open for writing (erases existing content); creates new file if one doesn't exist

a open for appending to end of content; creates new file if one doesn't exist

x create and open for writing (new in PHP 4.3.2)

r+ open for reading and writing (erases existing content when file is written to)

w+ open for writing and reading (erases existing content on opening or creates new file if one doesn't exist

a+ open for appending and writing; creates new file if one doesn't exist

x+ create and open for writing and reading (new in PHP 4.3.2)

Perancangan dan Pemrograman Web: PHP (wcw)

Reading from a File

• Fgets()• is used to read a file one line at a time

<?php $MyFile = fopen(“daftar.txt", 'r'); if (!$MyFile) {

echo '<p>Cannot open file.'; } else {

while (!feof($MyFile)) { $Employee = fgets($MyFile, 999); echo $Employee.'<br />';

} fclose($MyFile);

} ?>

Perancangan dan Pemrograman Web: PHP (wcw)

Writing to a File

• fwrite()• fwrite(file_pointer,output_string)

<?$OutputString=‘Menulis teks ke dalam file';$MyFile = fopen(‘daftar.txt', 'a'); fwrite($MyFile, $OutputString); fclose($MyFile);

?>

Perancangan dan Pemrograman Web: PHP (wcw)

Session

• Session Functions

Function Explanation

session_start() Starts new session if one does not exist. Continues current session if one exists.

session_unset() Unsets all session variables.

session_destroy() Kills session.

Perancangan dan Pemrograman Web: PHP (wcw)

Using Session

<?//Begin a session and create a session variable in //the $_SESSION array.

session_start(); $_SESSION[‘user'] = ‘Susilo'; echo $_SESSION[‘user'];

?>

Perancangan dan Pemrograman Web: PHP (wcw)

Using Session

<?

session_start(); if (isset($_SESSION[‘user'])) {

echo “You are Authorized as” . $_SESSION[‘user’] ;unset($_SESSION[‘user’] ) ;

}

?>

Perancangan dan Pemrograman Web: PHP (wcw)

Killing Session

<?

session_unset();session_destroy() ;

?>

Perancangan dan Pemrograman Web: PHP (wcw)

Directories

• File_exists• Check if a directory or a file exists

$dirpath = "/home/wibowo/ppw” ;if (! file_exists($dirpath)) {

mkdir($dirpath, 0777);echo “Directory is created now!”

}

Perancangan dan Pemrograman Web: PHP (wcw)

Directories

• readdir• Reading contents of a directory

$dirpath = "/home/wibowo/ppw” ;$dir_handle=@opendir($dirpath) or die("Unable to open $dirpath"); $flist = array() ;while ($file = readdir($dir_handle)) { if (! ($file == "." || $file=="..")) { $flist[] = $file ;

}}sort ($flist) ;foreach ($flist as $file) echo $file . “<br />” ;closedir($dir_handle);