- strpos: documentation ( source)
- print_r: documentation ( source)
- array_filter: documentation ( source)
<?php
$input = array(
'abc' => 0,
'foo-bcd' => 1,
'foo-def' => 1,
'foo-xyz' => 0,
);
$filtered = array_filter($input, function ($key) {
return strpos($key, 'foo-') === 0;
}, ARRAY_FILTER_USE_KEY);
print_r($filtered);