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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$string = null;
$string = is_null($string) ? 'null' : $string;
var_dump($string);
$string = 'string';
$string = is_null($string) ? 'null' : $string;
var_dump($string);
$string = null;
$string = is_null($s) ? 'null' : $string;
var_dump($string);