What debugging techniques or tools can be effective in identifying and resolving image manipulation issues in PHP scripts?

Issue: When working with image manipulation in PHP scripts, common issues can include incorrect file paths, incorrect image formats, or errors in the manipulation functions being used. To identify and resolve these issues, debugging techniques such as printing out variables, using error reporting functions, and checking for file permissions can be effective. PHP Code Snippet: 

// Example code to resize an image using the GD library
$image = imagecreatefromjpeg('path/to/image.jpg');

if ($image) {
    $width = imagesx($image);
    $height = imagesy($image);
    
    $newWidth = 100;
    $newHeight = ($height / $width) * $newWidth;
    
    $newImage = imagecreatetruecolor($newWidth, $newHeight);
    
    if ($newImage) {
        imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
        
        imagejpeg($newImage, 'path/to/resized_image.jpg');
        
        imagedestroy($image);
        imagedestroy($newImage);
    } else {
        echo 'Error creating new image';
    }
} else {
    echo 'Error loading image';
}

Keywords

Xdebug ImageMagick GD library PHP error logs var_dump

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