human couldn't understood php.

gistfile1.php

<?php

function test_foreach(&$tgt)
{
    foreach ($tgt as &$_t)
    {
        $_t['v'] = $_t['v'] + 1;
    }

    foreach ($tgt as $_t)
    {
        echo $_t['v'] . "\n";
    }
}

$tgt = array();
for ($i=0; $i<5; $i++)
{
    $tgt[] = array('v' => $i);
}
test_foreach($tgt);