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php 中如何判断是否为空

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2016-06-20 12:37:28998browse

```<?phperror_reporting(0);$a = ""; // 空$a = null; // 空$a = array(); // 空$a = false; // 空$a = 0; // 空$a = '0'; // 空$a = 1; // 不空$a = true; // 不空$a = array(1 => '1'); // 不空$a = ';'; // 不空$a = function () {echo 1;}; // 不空class a {};$a = new a(); // 不空if (!empty($a)) {    echo '不空';} else {    echo '空';}echo PHP_EOL;```

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