字符串翻转
<?php$s = 'strlen,substr,count';$o = '';$i = 0;while(isset($s[$i]) && $s[$i] != null) {$o = $s[$i++].$o;}echo $o;?>
将单词 翻转
<?php
$s = 'strlen substr count';$o = '';$i = 0;while($s[$i]) {$o = $s[$i++].$o;}echo $o;