- <?php
- $test=0;
- if($test==''){
- echo '<br />在php中,0即为空'; //被输出
- }
- if($test===''){
- echo '<br />在php中,0即为空'; //不被输出
- }
- if($test==NULL){
- echo '<br />在php中,0即为空'; //被输出
- }
- if($test===NULL){
- echo '<br />在php中,0即为空'; //不被输出
- }
- if($test==false){
- echo '<br />在php中,0即为空'; //被输出
- }
- if($test===false){
- echo '<br />在php中,0即为空'; //不被输出
- }
- ?>
来源: http://www.phpxs.com/code/1009960/