empty,isset,is_null你都搞清除了么？[转载] - zzwind's Blog

empty,isset,is_null你都搞清除了么？[转载]

zzwind posted @ 2010年2月07日 05:34 in php , 751 阅读

lovefang

<?php
$a1 = null;
$a2 = false;
$a3 = 0;
$a4 = '';
$a5 = '0';
$a6 = 'null';
$a7 = array();
$a8 = array(array());
echo empty($a1)?'T':'F';
echo empty($a2)?'T':'F';
echo empty($a3)?'T':'F';
echo empty($a4)?'T':'F';
echo empty($a5)?'T':'F';
echo empty($a6)?'T':'F';
echo empty($a7)?'T':'F';
echo empty($a8)?'T':'F';
echo empty($a9)?'T':'F';//$a9这个变量不存在
echo '<br/>';
echo isset($a1)?'T':'F';
echo isset($a2)?'T':'F';
echo isset($a3)?'T':'F';
echo isset($a4)?'T':'F';
echo isset($a5)?'T':'F';
echo isset($a6)?'T':'F';
echo isset($a7)?'T':'F';
echo isset($a8)?'T':'F';
echo isset($a9)?'T':'F';
echo '<br/>';
echo is_null($a1)?'T':'F';
echo is_null($a2)?'T':'F';
echo is_null($a3)?'T':'F';
echo is_null($a4)?'T':'F';
echo is_null($a5)?'T':'F';
echo is_null($a6)?'T':'F';
echo is_null($a7)?'T':'F';
echo is_null($a8)?'T':'F';
echo is_null($a9)?'T':'F';
?>

答案:

TTTTTFTFT
FTTTTTTTF
TFFFFFFFT

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