数组根据val值的相同性组成多个数组

$arr        =   array(            array(                'id'    =>  '1',                'name'      =>  'a',                'project'   =>  '1',            ),            array(                'id'    =>  '2',                'name'      =>  'b',                'project'   =>  '3',            ),            array(                'id'    =>  '3',                'name'      =>  'c',                'project'   =>  '2',            ),            array(                'id'    =>  '4',                'name'      =>  'd',                'project'   =>  '1',            ),        );

$arr1        =   array(            array(                'id'    =>  '1',                'name'      =>  'a',                'project'   =>  '1',            ),            array(                'id'    =>  '4',                'name'      =>  'd',                'project'   =>  '1',            ),        );        $arr2        =   array(            array(                'id'    =>  '2',                'name'      =>  'b',                'project'   =>  '3',            ),        );        $arr3        =   array(            array(                'id'    =>  '3',                'name'      =>  'c',                'project'   =>  '2',            ),        );

回复讨论(解决方案)

$arr        =   array(            array(                'id'    =>  '1',                'name'      =>  'a',                'project'   =>  '1',            ),            array(                'id'    =>  '2',                'name'      =>  'b',                'project'   =>  '3',            ),            array(                'id'    =>  '3',                'name'      =>  'c',                'project'   =>  '2',            ),            array(                'id'    =>  '4',                'name'      =>  'd',                'project'   =>  '1',            ),        );foreach($arr as $v) $r['arr' . $v['project']][] = $v;extract($r);print_r($arr1);

Array(    [0] => Array        (            [id] => 1            [name] => a            [project] => 1        )    [1] => Array        (            [id] => 4            [name] => d            [project] => 1        ))

extract（）一般什么时候用

谢谢了，第一次知道$r['arr' . $v['project']][] = $v; 还可以让数组自己找的对应位置，其实这一句就到达我想要的结果了，我那种方法自己都觉得累

extract（）之前看了下，大致就是把val直接给到$+key名的变量中