- var_dump: documentation ( source)
- print_r: documentation ( source)
<?php
$rose = "black";
${"rose"} = "white";
$rose = "red";
print_r(${"rose"});
echo "\n\n";
${" "} = "white";
print_r(${" "});
echo "\n\n";
$arr{" "} = 99;
var_dump($arr);
$o = (object) $arr;
var_dump($o);
echo $o->{" "},"\n";