Return values

return.php

<?php

$array = array
(
	1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
	"String 1", "Hello", 'World'
);

foreach ( $array as $value )
{
	// Get result
	$result = $this->is_even_integer($value);
	
	// Result is true
	if ( $result )
	{
		echo "The number '{$value}' is even <br />";
	}
	
	// Result is false
	if ( $result === false ) {
		echo "The number '{$value}' is odd <br />";
	}
	
	// Result is null
	if ( $result === null )
	{
		echo "'{$value}' is not an integer <br />";
	}
}
	
function is_even_integer( $number )
{
	// Return null if not an integer
	if ( ! is_integer($number))
	{
		return null;
	}
	
	// Check if value is odd or even
	return ( $number % 2 === 0 ) ? true : false;
}

?>