How to get the maximum upload size in WordPress using wp_max_upload_size
The wp_max_upload_size function in WordPress is designed to determine the maximum file size that can be uploaded to the WordPress site. The function retrieves this information from the configuration settings of both WordPress and the server. It compares the maximum upload size defined in WordPress with the maximum upload size defined in the server’s PHP settings, and returns the smaller value of the two.
This function can be useful in several scenarios. It can be used to inform users about the maximum file size they can upload, preventing them from attempting to upload files that are too large. This can help to avoid errors and improve the user experience. Additionally, it can be used by developers to ensure that they are not attempting to upload files that exceed the maximum allowed size, which can help to prevent errors and keep the website running smoothly.
Parameters
The wp_max_upload_size function in WordPress does not accept any parameters.
Return Value
The wp_max_upload_size function returns an integer that represents the permitted upload size.
Examples
How to Display Maximum Upload Size in WordPress
function display_max_upload_size() {
$max_upload_size = wp_max_upload_size();
$max_upload_size_in_mb = round($max_upload_size / 1024 / 1024);
echo '<p>Maximum upload size: ' . $max_upload_size_in_mb . ' MB</p>';
}
display_max_upload_size();
This code snippet defines a function display_max_upload_size() that fetches the maximum upload size allowed by WordPress using the wp_max_upload_size() function. It then converts the size from bytes to megabytes, and displays it in an HTML paragraph. The function is then called to execute this process.
How to Conditionally Check the Maximum Upload Size in WordPress
function check_max_upload_size() {
$max_upload_size = wp_max_upload_size();
if ($max_upload_size < 5000000) {
echo '<p>The maximum upload size is less than 5MB.</p>';
} else {
echo '<p>The maximum upload size is greater than or equal to 5MB.</p>';
}
}
check_max_upload_size();
This code snippet defines a function check_max_upload_size() that uses the wp_max_upload_size() function to fetch the maximum upload size allowed by WordPress. It then checks if the size is less than 5MB (5000000 bytes), and displays a corresponding message. The function is then called to execute this process.
How to Modify the Maximum Upload Size in WordPress
@ini_set( 'upload_max_filesize' , '64M' );
@ini_set( 'post_max_size', '64M');
@ini_set( 'max_execution_time', '300' );This code snippet is used to increase the maximum file upload size in WordPress. It uses the @ini_set() function to change the upload_max_size, post_max_size and max_execution_time settings in the PHP configuration. This will allow you to upload files up to 64MB and increase the maximum execution time to 300 seconds. Note that this may not work on some shared hosts that do not allow these settings to be overridden.
Conclusion
The WordPress function wp_max_upload_size is a built-in functionality that retrieves the maximum upload size allowed in php.ini. It’s primarily used to determine the largest file size that can be uploaded to the WordPress site. This function is crucial in managing the site’s resources and ensuring that the upload process runs smoothly without overloading the server’s capacity.