is_null() function — Finds if a variable is NULL or not.
PHP Version:
PHP 4 and above version.
Syntax:
is_null(variable);
Return Type: Boolean
Finds if a variable is NULL or not:
<!DOCTYPE html>
<html>
<body>
<h3>Showing result using is_null() function:</h3>
<h3>Showing result using is_null() function:</h3>
<?php
$x = 0;
echo "x is " . is_null($x) . "<br>";
$y = null;
echo "y is " . is_null($y) . "<br>";
$z = "null";
echo "z is " . is_null($z) . "<br>";
$q = NULL;
echo "q is " . is_null($q) . "<br>";
?>
</body>
</html>
Result:
Showing result using is_null() function:
x is
y is 1
z is
p is 1
x is
y is 1
z is
p is 1
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