Summary and techniques of several methods for detecting data types in PHP

The following editor will bring you several methods of detecting data types in PHP (summary). The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. 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. Data type of output 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)

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 <?php 

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

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

 ?>

3. Detect whether a variable is a specified data type (is_array, is_string, is_int, is_double, etc. ), returns 1 if true, returns null if false.

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 <?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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