Get file size using filesize() function in PHP
Jun 27, 2023 pm 03:14 PM
PHP is a server-side scripting language widely used in web development and is designed to provide support for the creation of dynamic web pages. One of the commonly used operations is to get the file size. File size is important to web developers as they need to ensure that the content of their website is not too large to impact the user experience.
In PHP, you can use the filesize() function to get the file size. The syntax of this function is as follows:
filesize (string $filename) : float
Where, $filename is the path of the file whose size is to be obtained. This function will return the size of the file in bytes. If the file does not exist or is inaccessible, FALSE is returned.
Next, we will introduce how to use the filesize() function in PHP to get the file size. In order to use this function, we need to prepare a file first. We can create a file using one of PHP's file manipulation functions as shown below:
<?php
$file = fopen('example.txt', 'w');
fwrite($file, 'This is an example file.');
fclose($file);
?>In the above example, we created and wrote to a file named "example.txt". Now let us use filesize() function to get the size of this file.
<?php $filename = 'example.txt'; $size = filesize($filename); echo "The size of $filename is $size bytes."; ?>
In the above code, we defined a variable $filename and set it to the file name "example.txt". Then, we call the filesize() function and save its return value into a variable called $size. Finally, we use the echo statement to display the file name and file size.
If everything is fine, you should see the following output:
The size of example.txt is 23 bytes.
In this example, we successfully used the filesize() function to get the size of the file we created. Using this function helps us ensure that our website content is appropriately sized and does not impact the user experience.
Summary:
The filesize() function is a simple and effective way to get the file size in PHP. We can use this function to get the size of our files so that we can ensure that our website content is not too large and affects the user's experience.
The above is the detailed content of Get file size using filesize() function in PHP. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Why We Comment: A PHP Guide
Jul 15, 2025 am 02:48 AM
PHPhasthreecommentstyles://,#forsingle-lineand/.../formulti-line.Usecommentstoexplainwhycodeexists,notwhatitdoes.MarkTODO/FIXMEitemsanddisablecodetemporarilyduringdebugging.Avoidover-commentingsimplelogic.Writeconcise,grammaticallycorrectcommentsandu
How to Install PHP on Windows
Jul 15, 2025 am 02:46 AM
The key steps to install PHP on Windows include: 1. Download the appropriate PHP version and decompress it. It is recommended to use ThreadSafe version with Apache or NonThreadSafe version with Nginx; 2. Configure the php.ini file and rename php.ini-development or php.ini-production to php.ini; 3. Add the PHP path to the system environment variable Path for command line use; 4. Test whether PHP is installed successfully, execute php-v through the command line and run the built-in server to test the parsing capabilities; 5. If you use Apache, you need to configure P in httpd.conf
PHP Syntax: The Basics
Jul 15, 2025 am 02:46 AM
The basic syntax of PHP includes four key points: 1. The PHP tag must be ended, and the use of complete tags is recommended; 2. Echo and print are commonly used for output content, among which echo supports multiple parameters and is more efficient; 3. The annotation methods include //, # and //, to improve code readability; 4. Each statement must end with a semicolon, and spaces and line breaks do not affect execution but affect readability. Mastering these basic rules can help write clear and stable PHP code.
PHP 8 Installation Guide
Jul 16, 2025 am 03:41 AM
The steps to install PHP8 on Ubuntu are: 1. Update the software package list; 2. Install PHP8 and basic components; 3. Check the version to confirm that the installation is successful; 4. Install additional modules as needed. Windows users can download and decompress the ZIP package, then modify the configuration file, enable extensions, and add the path to environment variables. macOS users recommend using Homebrew to install, and perform steps such as adding tap, installing PHP8, setting the default version and verifying the version. Although the installation methods are different under different systems, the process is clear, so you can choose the right method according to the purpose.
python if else example
Jul 15, 2025 am 02:55 AM
The key to writing Python's ifelse statements is to understand the logical structure and details. 1. The infrastructure is to execute a piece of code if conditions are established, otherwise the else part is executed, else is optional; 2. Multi-condition judgment is implemented with elif, and it is executed sequentially and stopped once it is met; 3. Nested if is used for further subdivision judgment, it is recommended not to exceed two layers; 4. A ternary expression can be used to replace simple ifelse in a simple scenario. Only by paying attention to indentation, conditional order and logical integrity can we write clear and stable judgment codes.
Your First PHP Script: A Practical Introduction
Jul 16, 2025 am 03:42 AM
How to start writing your first PHP script? First, set up the local development environment, install XAMPP/MAMP/LAMP, and use a text editor to understand the server's running principle. Secondly, create a file called hello.php, enter the basic code and run the test. Third, learn to use PHP and HTML to achieve dynamic content output. Finally, pay attention to common errors such as missing semicolons, citation issues, and file extension errors, and enable error reports for debugging.
What is PHP and What is it Used For?
Jul 16, 2025 am 03:45 AM
PHPisaserver-sidescriptinglanguageusedforwebdevelopment,especiallyfordynamicwebsitesandCMSplatformslikeWordPress.Itrunsontheserver,processesdata,interactswithdatabases,andsendsHTMLtobrowsers.Commonusesincludeuserauthentication,e-commerceplatforms,for
how to handle undefined index in PHP
Jul 15, 2025 am 02:08 AM
The "undefinedindex" error occurs because a key that does not exist in the array is accessed. Solutions include: 1. Use isset() to check whether the key exists, which is suitable for processing user input; 2. Use array_key_exists() to determine whether the key is set, and it can be recognized even if the value is null; 3. Use the empty merge operator?? to set the default value to avoid directly accessing undefined keys; in addition, you need to pay attention to common problems such as the spelling of form field names, the database result is empty, the array unpacking is not verified, the child keys are not checked in foreach, and the session_start() is not called.
