- print_r: documentation ( source)
<?php
$val = array(1,0,2,1,1);
$subtract = 3.5;
foreach($val as $key => $item){
if ($subtract > $item){
$subtract -= $item;
$val[$key] = 0;
}
else{
$val[$key] -= $subtract;
$subtract = 0;
}
}
print_r($val);