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bool is_scalar ( mixed $var )

<?php
function show_var($var) {
    if (is_scalar($var)) {
        echo $var;
    } else {
        var_dump($var);
    }
}
$pi = 3.1416;
$sites = array("tutorialpro", "Google", "Facebook");

show_var($pi);
echo PHP_EOL;
show_var($sites)
?>

3.1416
array(3) {
  [0]=>
  string(6) "tutorialpro"
  [1]=>
  string(6) "Google"
  [2]=>
  string(8) "Facebook"
}