- var_dump: documentation ( source)
<?php
$array = [
'free'=> 'No',
'me' => 'No',
'taken' =>'yes',
'Foo' => 'No',
'Bar' => 'Yes',
'something' =>'Yes'
];
$array['free'] = ($array['free'] == "No") ? 0 : 1;
$array['taken'] = ($array['taken'] == "No") ? 0 : 1;
$array['Foo'] = ($array['Foo'] == "No") ? 0 : 1;
$array['Bar'] = ($array['Bar'] == "No") ? 0 : 1;
var_dump($array);