PHP Regarding the judgment results of empty and isset for parameters, emptyisset
<?php
class test{}
$a1 = null;
$a2 = "";
//$a3 =
$a4 = 0;
$a5 = '0';
$a6 = false;
$a7 = array();
//var $a8;
$a9 = new test();
for ($i=1; $i <=9 ; $i++) {
$s = 'a'.$i;
echo $i . ":";
var_dump(isset($$s));
echo '<br />';
}
echo '<br />';
for ($i=1; $i <=9 ; $i++) {
$s = 'a'.$i;
echo $i . ":";
var_dump(empty($$s));
echo '<br />';
}
Copy after login
That’s basically it
http://www.bkjia.com/PHPjc/1070668.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1070668.htmlTechArticlePHP Regarding the judgment results of empty and isset for parameters, emptyisset ?phpclass test{}$a1 = null;$a2 = "";//$a3 = $a4 = 0;$a5 = '0';$a6 = false;$a7 = array();//var $a8;$a9 = new test();f.. .