How to Restrict File Upload Types and Size in PHP?

Restricting File Upload Types in PHP

You're facing issues with restricting file upload types to PDF, DOC, or DOCX and limiting file size to less than 400 KB. Your provided code attempts to validate file extensions and sizes; however, it has some flaws.

To resolve these issues, you can use the following code:

<code class="php">function allowed_file() {
    // Define allowed MIME types
    $allowed_types = array('application/doc', 'application/docx', 'application/pdf');

    // Validate uploaded files
    if (in_array($_FILES['resume']['type'], $allowed_types) && in_array($_FILES['reference']['type'], $allowed_types)) {
        // Check file sizes
        if ($_FILES["resume"]["size"] < 400000 && $_FILES["reference"]["size"] < 400000) {
            // Files allowed for upload
        } else {
            // File size exceeded limit
        }
    } else {
        // Invalid file type
    }
}</code>

Explanation:

• This code uses an array of allowed MIME types to validate the file types.
• It checks if the MIME types of both 'resume' and 'reference' files match an allowed type.
• If the file types are valid, it proceeds to check if their sizes are within the limit (less than 400 KB).
• Depending on the validation results, you can handle the file upload accordingly.

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