- strpos: documentation ( source)
- print_r: documentation ( source)
<?php
$row = array(
'useless' => 42,
'useful' => 'orange',
'useless_too' => 'banana',
'useful_too' => 'apples');
foreach ($row as $key1=>$value){
$pos = strpos($key1,'useful');
if($pos==-1)
unset($row[$key]);
}
print_r($row);