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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$int = 10;
$double = 3.14;
$string = "Hello";
$bool = true;
$array = [1, 2, 3];
$null = null;
echo "{gettype($int)}\n";
echo gettype($double) . "<br>"; // double
echo gettype($string) . "<br>"; // string
echo gettype($bool) . "<br>"; // boolean
echo gettype($array) . "<br>"; // array
echo gettype($null) . "<br>"; // NULL
?>