//array union or merge
$a = array('One', 'Two');
$b = array('Three', 'Four');
print '
'; print_r($a + $b); print '
';
//array union and assign
$b += array('Five', 'Six');
print '
'; print_r($b); print '
';
//array equal
var_dump($a == $b);
echo '
';
//array not equal
var_dump($a != $b);
echo '
';
var_dump($a <> $b);
echo '
';
//identical
var_dump($a === $a);
echo '
';
var_dump($a === $b);
echo '
';
//not identical
var_dump($a !== $a);
echo '
';
var_dump($a !== $b);