$arr = array(
array('a'=>1,'c'=>1),
array('a'=>1,'c'=>2),
array('a'=>2,'c'=>3),
array('a'=>2,'c'=>4),
array('a'=>3,'c'=>4)
);
$arr_new = array(
array('a'=>1,'c'=>'1,2'),
array('a'=>2,'c'=>'3,4'),
array('a'=>3,'c'=>'4')
);如果数组$arr中的'a'相同,则把'c'的值拼接成字符串,最后转换成$arr_new这个样子PHP
array('a'=>1,'c'=>1),
array('a'=>1,'c'=>2),
array('a'=>2,'c'=>3),
array('a'=>2,'c'=>4),
array('a'=>3,'c'=>4)
);
$arr_new = array(
array('a'=>1,'c'=>'1,2'),
array('a'=>2,'c'=>'3,4'),
array('a'=>3,'c'=>'4')
);如果数组$arr中的'a'相同,则把'c'的值拼接成字符串,最后转换成$arr_new这个样子PHP
array('a'=>1,'c'=>1),
array('a'=>1,'c'=>2),
array('a'=>2,'c'=>3),
array('a'=>2,'c'=>4),
array('a'=>3,'c'=>4)
);$arr_new = array();
foreach($arr as $r) {
if(isset($arr_new[$r['a']])) $arr_new[$r['a']]['c'] .= ',' . $r['c'];
else $arr_new[$r['a']] = $r;
}
print_r($arr_new);Array
(
[1] => Array
(
[a] => 1
[c] => 1,2
) [2] => Array
(
[a] => 2
[c] => 3,4
) [3] => Array
(
[a] => 3
[c] => 4
))要善于指挥计算机为你做事