- var_dump: documentation ( source)
<?php
$values = array('a'=>'foo','b'=>null,'c'=>'bar','d'=>'');
foreach ($values as $field=>&$value) {
if ($value === null || $value == '') {
$value = null;
continue;
}
$value = 'OK:'.$value;
}
unset($value);
var_dump($values);
?>