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PHP一个很简单有关问题

WBOY
WBOYOriginal
2016-06-13 10:11:40844browse

PHP一个很简单问题
判断一个变量,如果变量为空则不执行,比如if($a)之类,但我说的不执行是指不执行html,就是说if($a)(为假){html不显示
}不知道怎么样写,照着上面写法,会出现错误

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exit() ?
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if(!empty($a)){
?>
html---html-----
}
?>

或者

echo !empty($a)?'$a真时出现':'反之';
?>
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if($a){
?> 
显示html代码................

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可用ob函数控制
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