: It is critical to limit file types (e.g., only .jpg , .png ), restrict file size, and verify if the file already exists to prevent malicious scripts from being executed. 3. Alternative Implementation Methods

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: Modern applications often use XMLHttpRequest or libraries like Upload.js to upload files without refreshing the page, providing a more user-friendly experience.

A standard PHP file upload script (e.g., upload.php ) handles the received data using the $_FILES superglobal. Key steps include:

Uploading files via POST, when php script starts to execute?