php validate url – Best way to check if a URL is valid

php validate url : check if URL address syntax is valid or not. Validating URL by using FILTER_VALIDATE_URL filter in PHP to check query string and path.

php validate url

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The simplest and most consistent way to validate a URL in PHP. You can use PHP native function – filter_var to check if the string is normal test or a valid URL.

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Example : PHP FILTER_VALIDATE_URL Filter

index.html

<!DOCTYPE html>
<html>
<body>

<?php
// Variable to check
$website = "https://www.pakainfo.com";

// Validate website url
if (filter_var($website, FILTER_VALIDATE_URL)) {
  echo("Enter website URL is a valid URL");
} else {
  echo("Enter website URL is not a valid URL");
}
?>

</body>
</html>

Possible flags of validate URL in PHP

FILTER_FLAG_HOST_REQUIRED – URL must include host name (like https://www.pakainfo.com)

FILTER_FLAG_PATH_REQUIRED – URL must have a path after the domain name (like www.pakainfo.com/post)

Example : Validate URL With Regex

<?php 

$final_validation = "((https?|ftp)\:\/\/)?";
$final_validation .= "([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+!*(),;?&=\$_.-]+)[email protected])?";
$final_validation .= "([a-z0-9-.]*)\.([a-z]{2,3})";
$final_validation .= "(\:[0-9]{2,5})?";
$final_validation .= "(\/([a-z0-9+\$_-]\.?)+)*\/?";
$final_validation .= "(\?[a-z+&\$_.-][a-z0-9;:@&%=+\/\$_.-]*)?";
$final_validation .= "(#[a-z_.-][a-z0-9+\$_.-]*)?";

$url = 'https://pakainfo.com/';

if (preg_match("/^$final_validation$/i", $url)) {
   echo('Good Luck, Enter URL is a valid URL');
}

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