- print_r: documentation ( source)
<?php
$obj = new stdClass;
$obj->{'123'} = '456';
print_r($obj);
echo $obj->{'123'},"\n";
$obj->{'a123'} = $obj->{'123'};
print_r($obj);
echo $obj->a123,"\n";
$obj->a[] = $obj->{'123'};
$obj->a[] = $obj->{'a123'};
echo $obj->a[1],"\n";