How can the issue of duplicated "http://" in URLs be avoided in PHP code?

Issue: Duplicated "http://" in URLs can be avoided by checking if the URL already contains "http://" before appending it to the URL string. 

// Check if the URL already contains "http://" before appending it
$url = "http://example.com";

if (strpos($url, "http://") === false) {
    $url = "http://" . $url;
}

echo $url;

Keywords

PHP URL string manipulation regular expressions validation

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