How can multiple parameters be concatenated in a URL in PHP?

When concatenating multiple parameters in a URL in PHP, you can use the `http_build_query()` function to build a query string from an array of parameters. This function takes an associative array of parameters and constructs a URL-encoded query string. This is a cleaner and more efficient way to concatenate multiple parameters in a URL in PHP. 

$params = array(
    'param1' => 'value1',
    'param2' => 'value2',
    'param3' => 'value3'
);

$queryString = http_build_query($params);

$url = 'http://example.com/page.php?' . $queryString;

echo $url;

Keywords

PHP URL concatenation parameters query string

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