比如原数组是这样的
array(3) {
[0] => array(6) {
[pla_id] => string(3) 298
[user_id] => string(1) 1
[due_in] => string(15) 8.33
}
[1] => array(6) {
[pla_id] => string(3) 976
[user_id] => string(1) 1
[due_in] => string(15) 338.90
}
[2] => array(6) {
[pla_id] => string(3) 56
[user_id] => string(1) 2
[due_in] => string(15) 25.6
}}
因为数组中的user_id=1 是一样的
要得到最后这样数组，要怎么写(就是把user_id相同的其他元素拼接在一起)？
array(3) {
[0] => array(6) {
[pla_id] => string(3) 298,976
[user_id] => string(1) 1
[due_in] => string(15) 8.33,338.90
}
[1] => array(6) {
[pla_id] => string(3) 56
[user_id] => string(1) 2
[due_in] => string(15) 25.6
}}
------解决思路----------------------
$a = array(
array(
pla_id => 298,
user_id => 1,
due_in => 8.33,
),
array(
pla_id => 976,
user_id => 1,
due_in => 338.90,
),
array(
pla_id => 56,
user_id => 2,
due_in => 25.6,
)
);
$b = array();
foreach($a as $v) {
if(! isset($b[$v['user_id']])) $b[$v['user_id']] = $v;
else $b[$v['user_id']][due_in] .= ',' . $v[due_in];
}
var_dump(array_values($b));
array(2) {
[0]=> array(3) {
[pla_id]=> string(3) 298
[user_id]=> string(1) 1
[due_in]=> string(11) 8.33,338.90
}
[1]=> array(3) {
[pla_id]=> string(2) 56
[user_id]=> string(1) 2
[due_in]=> string(4) 25.6
}
}