What are the best practices for handling image manipulation functions like imagecopyresized() and imagecopymerge() in PHP?

When using image manipulation functions like imagecopyresized() and imagecopymerge() in PHP, it is important to properly handle errors and ensure that the functions are executed successfully. This can be achieved by checking the return values of these functions and handling any potential errors gracefully. Additionally, it is recommended to properly sanitize input data to prevent security vulnerabilities. 

// Example of handling image manipulation functions in PHP
$source = imagecreatefromjpeg('source.jpg');
$destination = imagecreatetruecolor(200, 200);

if ($source && $destination) {
    if (imagecopyresized($destination, $source, 0, 0, 0, 0, 200, 200, imagesx($source), imagesy($source))) {
        // Image resized successfully
        imagejpeg($destination, 'resized_image.jpg');
    } else {
        // Error handling for imagecopyresized
        echo 'Error resizing image';
    }

    imagedestroy($source);
    imagedestroy($destination);
} else {
    // Error handling for imagecreatefromjpeg or imagecreatetruecolor
    echo 'Error creating images';
}

Keywords

image manipulation imagecopyresized imagecopymerge PHP functions best practices

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