- print_r: documentation ( source)
- array_merge: documentation ( source)
<?php
$arr1 = array(
'11' => '11',
'22' => '22',
'33' => '33',
'44' => '44'
);
$arr2 =array(
'44' => '44',
'55' => '55',
'66' => '66',
'77' => '77'
);
print_r(array_merge($arr1, $arr2));