- strpos: documentation ( source)
- print_r: documentation ( source)
- array_filter: documentation ( source)
<?php
$animal = array('lion','elephant','tiger');
$search = 'io';
$res = array_filter($animal, function($v, $k) use($search){
return strpos($v, $search);
}, ARRAY_FILTER_USE_BOTH);
echo '<pre>';
print_r($res);