The difference between 0 and null in PHP

For PHP beginners, they will encounter many problems during learning, so we must learn to summarize them. To be 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. I hope everyone can learn from this simple explanation. Learn to think and summarize.

<?php
$test=0;
if($test==&#39;&#39;){
echo &#39;<br />在php中，0即为空&#39;; //被输出
}
if($test===&#39;&#39;){
echo &#39;<br />在php中，0即为空&#39;; //不被输出
}
if($test==NULL){
echo &#39;<br />在php中，0即为空&#39;; //被输出
}
if($test===NULL){
echo &#39;<br />在php中，0即为空&#39;; //不被输出
}
if($test==false){
echo &#39;<br />在php中，0即为空&#39;; //被输出
}
if($test===false){
echo &#39;<br />在php中，0即为空&#39;; //不被输出
}
?>

The above is the difference between 0 and null in PHP. Although a few lines of code seem simple, they are still very useful in work. I hope it will be helpful to everyone.

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