php有没得直接把字符串分割为keyvalue形式的函数,该怎么处理

$str = 'a,100,b,32,c,10,d,20';$res_str = implode(',',array_map(create_function('$v', 'return implode("=>",$v);'), array_chunk(explode(',', $str), 2)));$res =  eval("return array($res_str);");echo '
';print_r($res);echo '
';/*Array(    [a] => 100    [b] => 32    [c] => 10    [d] => 20)*/
------解决方案--------------------
直接的函数没有，恶心的代码有很多...

PHP code
$Str = 'a,100,b,32,c,10';preg_match_all('/[a-z]+/i', $Str, $Aarray);$Aarray = $Aarray[0];preg_match_all('/[0-9]+/', $Str, $Barray);$Barray = $Barray[0];$Carray = array_combine($Aarray, $Barray);print_r($Carray);
------解决方案--------------------
11文 你又来鸟 我只想到 explode
PHP code
$str = 'a,100,b,32,c,10';$arr = explode(',',$str);for($i = 0 ; $i ------解决方案--------------------
来一个另类的
PHP code
$s = 'a,100,b,32,c,10';preg_replace('/(\w+),([^,]+)/se', '$ar[$1]=$2', $s);print_r($ar);