多个数组形成另一个数组的问题

Question

php数组

Answer 1

$a = array(
  'Category' => 'TOTAL',
  'January2014_Number_stores' => 0,
  'February2014_Number_stores' => 0,
  'March2014_Number_stores' => 0,
);$b = array(
  array(
    'January2014_Number_stores' => 155,
    'February2014_Number_stores' => 155,
    'March2014_Number_stores' => 155,
  ),
  array(
    'January2014_Number_stores' => 126,
    'February2014_Number_stores' => 126,
    'March2014_Number_stores' => 126,
  ),
  array(
    'January2014_Number_stores' => 37,
    'February2014_Number_stores' => 37,
    'March2014_Number_stores' => 37,
  ),
  array(
    'January2014_Number_stores' => 9,
    'February2014_Number_stores' => 9,
    'March2014_Number_stores' => 9,
  ),
  array(
    'January2014_Number_stores' => 4,
    'February2014_Number_stores' => 4,
    'March2014_Number_stores' => 4,
  ),
);
foreach($b as $r) {
  foreach($r as $k=>$v) {
    if(! isset($a[$k])) $a[$k] = 0;
    $a[$k] += $v;
  }
}
print_r($a);Array
(
    [Category] => TOTAL
    [January2014_Number_stores] => 331
    [February2014_Number_stores] => 331
    [March2014_Number_stores] => 331
)

Answer 2

如果要设置求和所得数组中数据的格式（每3位一个,），number_format函数该写在哪里？

Answer 3

算完了再格式化$ar = array(
  'Category' => 'TOTAL',
  'January2014_Number_stores' => 10331,
  'February2014_Number_stores' => 500331,
  'March2014_Number_stores' => 4512331,
);
foreach($ar as &$v) if(is_numeric($v)) $v = number_format($v);
print_r($ar);Array
(
    [Category] => TOTAL
    [January2014_Number_stores] => 10,331
    [February2014_Number_stores] => 500,331
    [March2014_Number_stores] => 4,512,331
)

Answer 4

再请教下，如果我要把前两项相除赋值给第三项(3个数据为一组)该怎么写？
$ctt=0;
foreach($items_sum as &$v) {
if($ctt%3==0){
$v =....;//前两项相除得到第三项
}
if(is_numeric($v)) $v = number_format($v);
$ctt++;
}

Answer 5

$ar = array(
  'Category' => 'TOTAL',
  'January2014_Number_stores' => 10331,
  'February2014_Number_stores' => 500331,
  'March2014_Number_stores' => 4512331,
);$ar['March2014_Number_stores'] = $ar['January2014_Number_stores'] / $ar['February2014_Number_stores'];实际使用时还需检查除数（$ar['February2014_Number_stores']）是否等于 0

Answer 6

再请教下，如果我要把前两项相除赋值给第三项(3个数据为一组)该怎么写？
$ctt=0;
foreach($items_sum as &$v) {
if($ctt%3==0){
$v =....;//前两项相除得到第三项
}
if(is_numeric($v)) $v = number_format($v);
$ctt++;
}
$ctt=0;
$s1=0;
$s2=0;
foreach($items_sum as &$v) {
if($ctt==1){
$s1=$v;
}
if($ctt==2){
$s2=$v;
}
if($ctt%3==0){
$v =xx($s2,$s1);
$ctt=0;
}
if(is_numeric($v)) $v = number_format($v);
$ctt++;
}