if null check in php code example

Example 1: is null php

// The is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.

<?php
    $var = NULL;  
	if (is_null($var)) {
      	echo "yes, is null";
      
    } else {
      	echo "not null";
    }
?>

Example 2: php inline if null check

$username = null;
$name = $username ?? 'unknown';
# Use unknown as name if the username variable isn't set.

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