Workshop 8 PHP Working with directories

Working with Files and Folders With PHP

Files

Testing files, lets test for some existence and status of a file called text1.txt

<?php 

// Checking its existence 
if (file_exists("text1.txt")) { 
    echo "The file text1.txt exists!";
} 

// checking the status of files 
if (is_readable("text1.txt")) {
    echo "The file text1.txt is readable";
}

if (is_writeable("text1.txt")) { 
    echo "The file text1.txt is writeable";
}

if (is_executable("text1.txt")) { 
    echo "The file text1.txt is exectuable";
} 
?> 

You probably only see "The file text1.txt exists". If you only see this, you will need to chmod the read,write and execute settings on that file.

Reading data from files

<?php 

$filename = "text1.txt"; 
$fp = fopen($filename, "r") or die ("Could not open $filename"); 
while (!feof($fp)) { // While not end of file 
    $data = fread($fp, 16); // Reading the file in chunkcs of 16 bytes
    echo "$data <br>";
}
?>

There are multiple ways you can read from a file includes
Fgets() : Reading line by line
Fgetc() : Reading a character


Writing to a file

<?php 

$filename = "text1.txt"; 
echo "Begin writing to file $filename <br>";
$fp = fopen($filename, "w") or die ("Could not open $filename"); // OPen for writing 
fwrite ($fp, "I'm making changes \n");
fclose($fp);
?>

If you have trouble writing to the file, it could be a permission setting. Try chmod 777 . This will give all permissions to the file only. Chmod 777 to the directory give all permissions to the directory and not advisable.

Appending to a file

<?php 

$filename = "text1.txt"; 
echo "Appending to a file $filename <br>";
$fp = fopen($filename, "a") or die ("Could not open $filename"); // OPen for writing 
fputs ($fp, "\n Another thing I want to add  \n");
fclose($fp);
?>

The file text1.txt will have a new line called Another thing I want to add.


Directories

Creating a new directory

<?php 

mkdir ("testdir", 0755);
?>

If you failed to create a directory, again it usually means you have incorrect permissions settings.


Directory listing

<?php 

$dirname = ".";
$dn = opendir($dirname) or die ("Could not open directory");

while (!(($file = readdir($dn)) === false ) ) { 
    if (is_dir("$dirname/$file")) { 
    echo "(D) "; // To signify a folder 
} 
echo "$file <br>";
}
closedir ($dn);
?>