What impact does the use of echo and exit have on the image generation process in the given PHP code?

Using echo and exit in the middle of generating an image can cause issues because they output data to the browser before the image data is fully generated. This can corrupt the image data and result in a broken or incomplete image being displayed. To solve this issue, we should capture the image data in a buffer and then output it all at once at the end of the script execution. 

ob_start(); // Start output buffering

// Image generation code here

$imageData = ob_get_clean(); // Get the buffered image data

header('Content-Type: image/png'); // Set the content type to PNG image
echo $imageData; // Output the image data

exit; // Terminate the script execution

Keywords

echo exit image generation PHP code impact

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