Save and overwrite if necessary GD file in PHP [closed]

Use the function imagepng() as you are doing.

If it doesn't exist an image it creates a new one.

By default it will overwrite the file if it already exists.

The problem you are talking about in my opinion is related to the file permissions or the way the file path is handled.

@Jakkapong Rattananen

"I think your user that use for run php doesn't has permission to write to your file path."

I think the same.

Your user must have permissions or the path must be writeable.

To be sure set it up to 666 or better to 777.

Take a look at the complete code to do what you want to do

// Resizing or modifying the image
imagecopyresampled($temp, $image, 0, 0, 0, 0, $neww, $newh, $oldw, $oldh);

$path = "../tempfiles/"; //it's yout path $target_path1
$path .= $usertoken . "-tempimg.png"; //adding your filename dynamically generated

// CHECK PERMISSIONS - Ensure the directory exists and is writable !!!!!!!!!
if (!is_dir(dirname($path))) {
    mkdir(dirname($path), 0755, true);  // Create the directory (if it doesn't exist)
}

// CHECK PERMISSIONS - Make sure the file can be overwritten !!!!!!!!!
if (file_exists($path) && !is_writable($path)) {
    chmod($path, 0666); // Also make sure you have permission to do this
}

// THEN FINALIZE

// Save the image, overwriting if it exists
imagepng($temp, $path);

// Cleanup for memory saving
imagedestroy($temp);
imagedestroy($image);

It's basically your code, but improved. So in this way you check if you have permissions (hopefully so).

If you want to be sure or know what's going on, add some else with echo or returns where you see // CHECK PERMISSIONS.

Also check that the characters contained in $usertoken are allowed by your machine system.