此时,is_scalar内置函数就派上用场了。
is_scalar -- 检测变量是否是一个标量
标量变量是指那些包含了 integer、float、string 或 boolean的变量,而 array、object 和 resource 则不是标量。
function show_var($var) {
if (is_scalar($var)) {
echo $var;
} else {
var_dump($var);
}
}
$pi = 3.1416;
$proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");
show_var($pi);
// 打印:3.1416
show_var($proteins)
// 打印:
// array(3) {
// [0]=>
// string(10) "hemoglobin"
// [1]=>
// string(20) "cytochrome c oxidase"
// [2]=>
// string(10) "ferredoxin"
// }
?>
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