PHP Exercises: Get the size of a file

Last update on April 19 2025 11:49:35 (UTC/GMT +8 hours)

39. Get File Size

Write a PHP program to get the size of a file.

Sample Solution:

PHP Code:

<?php
// Open a file "/home/students/ppp.txt" for writing, or display an error message if unable to open
$myfile = fopen("/home/students/ppp.txt", "w") or die("Unable to open file!");

// Text to be written to the file
$txt = "PHP Exercises\n";
// Write the first line to the file
fwrite($myfile, $txt);

// Additional text to be written to the file
$txt = "from\n";
// Write the second line to the file
fwrite($myfile, $txt);

// More text to be written to the file
$txt = "w3resource\n";
// Write the third line to the file
fwrite($myfile, $txt);

// Close the file after writing
fclose($myfile);

// Display the size of the created file "/home/students/ppp.txt"
echo "Size of the file: " . filesize("/home/students/ppp.txt") . "\n";
?>

Explanation:

Open the File:

fopen("/home/students/ppp.txt", "w") opens the file ppp.txt in write mode.
If the file cannot be opened, die("Unable to open file!") displays an error message.

Write Text to the File:

fwrite($myfile, $txt) writes text to the file.
Three different strings ("PHP Exercises\n", "from\n", and "w3resource\n") are written to the file in separate fwrite calls.

Close the File:

fclose($myfile) closes the file after writing.

Display File Size:

filesize("/home/students/ppp.txt") gets the size of the file.
The size is printed with "Size of the file: ".

Output:

Size of the file: 30

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to obtain a file’s size in bytes and convert it to kilobytes with two-decimal precision.
Write a PHP script to iterate through a directory, determining and comparing the size of each file.
Write a PHP script to extract the size of a remote file without downloading its full content.
Write a PHP script to check if a file exceeds a specified size threshold and log a warning if it does.

PHP Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a PHP program to valid an email address.
Next: Write a PHP program to calculate the mod of two given integers without using any inbuilt modulus operator.