- print_r: documentation ( source)
<?php
$activeSkillList = new ArrayObject();
$activeSkillList['U1_1021002'] = array(
'refCardId'=> 'U1_1021002');
$activeSkillList['U3_1052005'] = array(
'refCardId'=> 'U3_1052005');
print_r($activeSkillList);
foreach($activeSkillList as $key => $value) {
print_r($value);
}