What potential issue can arise from using the "echo" function for testing the image output?

Using the "echo" function for testing image output can result in the image being corrupted or not displayed correctly, as "echo" is used for text output. To properly test image output, you should use the appropriate image functions like "imagepng" or "imagejpeg" to output the image data. 

// Example code snippet demonstrating the correct way to output image data
header('Content-Type: image/png');

$image = imagecreate(200, 200);
$black = imagecolorallocate($image, 0, 0, 0);
imagestring($image, 5, 50, 100, 'Test Image', $black);

imagepng($image);
imagedestroy($image);

Keywords

echo function testing image output potential issue

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