php if variable is null 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 check for null

is_null($foo)

Example 3: php check for empty string

if (empty($var)) {
    echo '$var is either 0, empty, or not set at all';
}

Example 4: is null php

is_null($var)