PHP data types and judgment variable types

PHP data types include: string, integer, floating point number, Boolean, array, object, NULL.

How to determine the variable type, use the var_dump function.
The var_dump function is to determine the type and length of a variable and output the value of the variable. If the variable has a value, it will lose the value of the variable and return the data type.

<meta charset="UTF-8">
<?php
$val1 = 1;
$val2 = 3.14;
$val3 = &#39;阅谁问君诵，水落清香浮。&#39;;
$val4 = array(&#39;aaa&#39;,&#39;bbb&#39;);
$val5 = true;
$val6 = function(){};
$val7 = null;
var_dump($val1);//整数
echo &#39;<br>&#39;;
var_dump($val2);//浮点数
echo &#39;<br>&#39;;
var_dump($val3);//字符串
echo &#39;<br>&#39;;
var_dump($val4);//数组
echo &#39;<br>&#39;;
var_dump($val5);//布尔
echo &#39;<br>&#39;;
var_dump($val6);//对象
echo &#39;<br>&#39;;
var_dump($val7);//NULL
?>

Rendering:

PS: Since the encoding used is UTF-8, each Chinese character occupies 3 bytes, while each English character occupies 1 byte.