PHP一个数组操作方法求解解决方案

array('0'=>'a',1=>'b',2=>'c',3=>'d',4=>'e',5=>'f');

array('a'=>'b','c'=>'d','e'=>'f');

$arr = array('0'=>'a',1=>'b',2=>'c',3=>'d',4=>'e',5=>'f','6'=>'g','7'=>'h');
$i = 0;
$len = count($arr);
$newArr = array();
while($i < $len){
	$newArr[$arr[$i]] = $arr[$i+1];
	$i += 2;
}
var_dump($newArr);
?> 

$arr = array('0'=>'a',1=>'b',2=>'c',3=>'d',4=>'e',5=>'f','6'=>'g','7'=>'h','8'=>'i');
$i = 0;
$len = count($arr);
$newArr = array();
while($i < $len){
    $newArr[$arr[$i]] = array_key_exists($i+1,$arr)?$arr[$i+1]:null;
    $i += 2;
}
var_dump($newArr);
?> 

$a = array('0'=>'a',1=>'b',2=>'c',3=>'d',4=>'e',5=>'f', 'G');
foreach(array_chunk($a, 2) as $t) {
  $b[$t[0]] = @$t[1];
}
print_r($b);

Array
(
    [a] => b
    [c] => d
    [e] => f
    [G] => 
)