What are the differences between using a URL and a file path in PHP, and how can these differences impact the functionality of functions like imagepng()?

When using functions like imagepng() in PHP to save an image, it is important to understand the differences between using a URL and a file path. Using a URL may not work as expected because the function requires a file path on the server's filesystem. To ensure proper functionality, always use a file path when working with functions like imagepng(). 

// Using a file path instead of a URL to save an image using imagepng()
$image = imagecreatefrompng('image.png');
imagepng($image, '/path/to/save/image.png');
imagedestroy($image);

Keywords

URL file path PHP imagepng() functionality

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