The difference between 0 and empty in php_PHP tutorial

As a qualified PHP programmer, you must know some basic knowledge, such as the difference between 0 and null. Regarding this difference, the following is a simple analysis through several examples. The truth is only It can be understood but cannot be expressed in words. Readers can slowly understand it by themselves.

<?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
}

?>

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http://www.bkjia.com/PHPjc/764081.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/764081.htmlTechArticleAs a qualified PHP programmer, you must know some basic knowledge, such as the difference between 0 and null. Regarding this difference, let’s conduct a simple analysis through several examples, among which...