php-isset和empty
<?php $a = null; if(isset($a)){ echo "is set"."\n"; } else{ echo "not set"."\n"; } if(empty($a)){ echo "is empty"."\n"; } else{ echo "not empty"."\n"; } ?> not set is empty
<?php $a = 0; if(isset($a)){ echo "is set"."\n"; } else{ echo "not set"."\n"; } if(empty($a)){ echo "is empty"."\n"; } else{ echo "not empty"."\n"; } ?> is set is empty
posted on 2018-09-04 10:57 www_practice 阅读(177) 评论(0) 编辑 收藏 举报