变量区别

2009-08-07 文章来源：互联网浏览次数：848 分享文章

$j = "";
if(empty($j)){    
    echo "yes";
}else{
    echo "no";
}
echo count($j);

结果：Yes 1

$j = null;
if(empty($j)){
    echo "Yes ";
}else{
    echo "No ";
}
echo count($j);

结果：Yes 0

$j = "test";
if(empty($j)){
    echo "Yes ";
}else{
    echo "No ";
}
echo count($j);

结果：No 1