What is the difference between using "?" and "&" when appending variables to a URL in PHP?

When appending variables to a URL in PHP, we use "?" to indicate the start of the query string and "&" to separate multiple variables within the query string. The "?" is used at the beginning of the query string, while "&" is used to separate additional variables added to the URL. Using "?" as the first character and "&" to separate variables ensures that the URL is properly formatted and the variables are passed correctly. 

// Example of appending variables to a URL using "?" and "&"
$variable1 = 'value1';
$variable2 = 'value2';

$url = 'http://example.com/api/data.php';
$url .= '?variable1=' . $variable1;
$url .= '&variable2=' . $variable2;

echo $url;

Keywords

PHP URL variables appending difference

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