PHP gets the type of variable

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In PHP, you can pass gettypeGet the type of variable.

Example:

<?php
$a=123;//整型
$b=&#39;123&#39;;//字符串型
$c=1.23;//浮点型
$d=true;//布尔型
$e=null;//NULL型
echo &#39;$a是&#39;,gettype($a),&#39;型&#39;,&#39;<br />&#39;;
echo &#39;$b是&#39;,gettype($b),&#39;型&#39;,&#39;<br />&#39;;
echo &#39;$c是&#39;,gettype($c),&#39;型&#39;,&#39;<br />&#39;;
echo &#39;$d是&#39;,gettype($d),&#39;型&#39;,&#39;<br />&#39;;
echo &#39;$e是&#39;,gettype($e),&#39;型&#39;,&#39;<br />&#39;;
?>

The output result is:

$a是integer型
$b是string型
$c是double型
$d是boolean型
$e是NULL型

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