How can error handling be improved in the PHP code to provide more detailed information on why the captcha image may not be displaying properly on certain systems?

The issue with the captcha image not displaying properly on certain systems may be due to errors in the GD library or incorrect image settings. To provide more detailed information on why the captcha image may not be displaying, we can implement better error handling in the PHP code by checking for specific GD library errors and displaying relevant error messages. 

// Set error handling for GD library functions
function gd_error_handler($errno, $errstr) {
    echo "GD Error: $errstr";
}

// Set error handler
set_error_handler("gd_error_handler");

// Generate captcha image
$width = 200;
$height = 50;
$image = imagecreate($width, $height);

if(!$image) {
    trigger_error("Failed to create image", E_USER_ERROR);
}

// Output the image
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);

// Restore default error handler
restore_error_handler();

Keywords

error handling PHP code captcha image detailed information systems

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