What are some strategies for optimizing the performance of file checking operations in PHP, especially in scenarios involving multiple images in a forum environment?

When dealing with multiple images in a forum environment, it's important to optimize file checking operations in PHP to ensure efficient performance. One strategy is to utilize functions like `file_exists()` and `is_uploaded_file()` to quickly check if a file exists or if it has been uploaded. Additionally, consider implementing caching mechanisms to store file information and reduce the need for repetitive file checks.

// Example of optimizing file checking operations in PHP for multiple images in a forum environment

// Check if a file exists
if (file_exists($file_path)) {
    // File exists, proceed with operations
    // ...
} else {
    // File does not exist, handle accordingly
    // ...
}

// Check if a file has been uploaded
if (is_uploaded_file($_FILES['image']['tmp_name'])) {
    // File has been uploaded, process the file
    // ...
} else {
    // File has not been uploaded, handle accordingly
    // ...
}