What are the potential pitfalls of trying to upload multiple files at once in PHP?

Potential pitfalls of trying to upload multiple files at once in PHP include handling file conflicts, ensuring proper file validation, and managing server resources efficiently. To solve these issues, you can use a loop to iterate through each file in the $_FILES array and process them individually. 

if(isset($_FILES['files'])){
    $errors = [];

    foreach($_FILES['files']['tmp_name'] as $key => $tmp_name){
        $file_name = $_FILES['files']['name'][$key];
        $file_size = $_FILES['files']['size'][$key];
        $file_tmp = $_FILES['files']['tmp_name'][$key];
        $file_type = $_FILES['files']['type'][$key];

        // Add file validation and processing logic here

        if(move_uploaded_file($file_tmp, "uploads/" . $file_name)){
            echo "File uploaded successfully: " . $file_name . "\n";
        } else {
            $errors[] = "Failed to upload file: " . $file_name;
        }
    }

    if(!empty($errors)){
        foreach($errors as $error){
            echo $error . "\n";
        }
    }
}

Keywords

file upload PHP multiple files limitations memory exhaustion

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