- implode: documentation ( source)
- array_filter: documentation ( source)
- range: documentation ( source)
<?php
$arr = range(0,10);
$arr2 = array('key1'=>'value1','key2'=>'value2','key3'=>'value3');
$test1 = array_filter($arr1,'odd');
echo implode('',$arr)."\t";
echo implode('',$arr2)."\t";
echo $test1."\t";