How can JavaScript be used to prevent clients from uploading files that exceed the post_max_size limit in PHP?

When a client tries to upload a file that exceeds the post_max_size limit in PHP, the server will reject the request and the file will not be uploaded. To prevent this from happening, you can use JavaScript to check the file size before it is uploaded and alert the user if it exceeds the limit. 

<?php
// Check if the file size exceeds the post_max_size limit
if ($_SERVER['CONTENT_LENGTH'] > (1024 * 1024 * ini_get('post_max_size'))) {
    die('File size exceeds the post_max_size limit.');
}

// Continue with file upload process
// Your file upload code here
?>

Keywords

JavaScript file upload post_max_size limit validation

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