Summary of several methods for detecting data types in PHP

The following editor will bring you several methods (summary) of PHP detection data type. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

In JavaScript, use typeof to detect basic data types, and use instanceof to detect reference data types. In PHP, there are also methods to detect data types, as follows:

1. Output the data type of variable (gettype)

<?php 

   $arry = array(&#39;a&#39;,&#39;b&#39;,&#39;c&#39;); 

   echo gettype($arry);//array 

 ?>

2. Data type of output variable, included quantity and specific content (var_dump)

View source code printing code help

 <?php 

   $str = &#39;hello world&#39;; 

   var_dump($str);//string(11) "hello world"  

 ?>

3. Check whether a variable is of the specified data type (is_array, is_string, is_int, is_double, etc.). If it is true, it returns 1, if it is false, it returns empty.

View source code print code help

 <?php 

   $num = 123; 

   if(is_array($num)){ 

     echo &#39;这是一个数组&#39;; 

   }else if(is_string($num)){ 

     echo &#39;这是一个字符串&#39;; 

   }else if(is_int($num)){ 

     echo &#39;这是一个整数&#39;; 

   }else if(is_double($num)){ 

     echo &#39;这是一个浮点数&#39;; 

   } 

 ?>

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