What potential issues could arise when using PHP to handle form input for image filenames?

One potential issue that could arise when using PHP to handle form input for image filenames is the risk of allowing users to upload malicious files by manipulating the filename input. To solve this issue, you can use PHP's `pathinfo()` function to extract the file extension from the filename and validate it against a list of allowed extensions before processing the file. 

$allowedExtensions = array("jpg", "jpeg", "png", "gif");
$filename = $_FILES['image']['name'];
$extension = pathinfo($filename, PATHINFO_EXTENSION);

if (!in_array($extension, $allowedExtensions)) {
    // Handle invalid file extension error
} else {
    // Process the file
}

Keywords

file uploads file validation file handling security vulnerabilities file naming conventions

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