php checking if the last character is a ‘/’ if not then tack it on

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You might be overthinking it. While the substr() method will work perfectly it might be simpler to use rtrim() to remove any trailing slashes and then add one on.

$path = rtrim($path, "https://stackoverflow.com/") . "https://stackoverflow.com/";

Caution: this will trim multiple trailing forward slashes. so .////// becomes ./

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