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Unable to use file_get_contents(), returns nothing


I managed to get the contents using curl like this:

$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL,
"https://ninjacourses.com/explore/4/");
$result = curl_exec($ch);
curl_close($ch);

Categories : PHP

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How can convert file with contents of string to the file with contents of byte?
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R cor(), method="pearson" returns NA, but method="spearman" returns value. Why?
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