What are some best practices for handling image manipulation functions in PHP to prevent errors?

When handling image manipulation functions in PHP, it is important to validate user input to prevent errors such as file type mismatches, invalid image dimensions, or potential security vulnerabilities. One way to mitigate these risks is to use PHP's built-in functions like `getimagesize()` to check the image file before processing it. 

// Example of validating image file before manipulation
$image = $_FILES['image']['tmp_name'];

// Check if the uploaded file is a valid image
$image_info = getimagesize($image);
if ($image_info === false) {
    die('Invalid image file');
}

// Continue with image manipulation functions
// e.g. imagecreatefromjpeg(), imagecreatetruecolor(), imagecopyresampled(), etc.

Keywords

image manipulation PHP functions error prevention GD library image processing

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