- array_shift: documentation ( source)
<?php
function permutation(array $arr)
{
while($ele=array_shift($arr))
{
$x=$ele;
echo $x."\n";
foreach($arr as $rest)
{
$x.=" $rest";
echo $x."\n";
}
}
}
permutation(array("Rafting","Hiking","Running","Biking"));