How can undefined constant errors be resolved when using cUrl in PHP?

To resolve undefined constant errors when using cUrl in PHP, you need to enclose the cUrl constants in quotes. This is because PHP treats constants without quotes as literals, resulting in undefined constant errors. 

// Before
curl_setopt($ch, CURLOPT_URL, $url);

// After (fix)
curl_setopt($ch, CURLOPT_URL, $url);

Keywords

cUrl PHP undefined constant errors resolution

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