php合并二维数组相同的key
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2022-05-11 16:52:12
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有个二维数组:
$arr = array(
array('num'=>5,'period'=>3),
array('num'=>10,'period'=>3),
array('num'=>15,'period'=>9)
);
对period相同的值的数组,对num求和,怎么处理变成:
$arr = array(
array('num'=>15,'period'=>3),
array('num'=>15,'period'=>9)
);
回复内容:
有个二维数组:
$arr = array(
array('num'=>5,'period'=>3),
array('num'=>10,'period'=>3),
array('num'=>15,'period'=>9)
);
对period相同的值的数组,对num求和,怎么处理变成:
$arr = array(
array('num'=>15,'period'=>3),
array('num'=>15,'period'=>9)
);
把 @mot 的答案补完优雅一下:
$arr = array(
array('num'=>5,'period'=>3),
array('num'=>10,'period'=>3),
array('num'=>15,'period'=>9)
);
$temp = array();
foreach($arr as $item) {
list($n, $p) = array_values($item);
$temp[$p] = array_key_exists($p, $temp) ? $temp[$p]+$n : $n;
}
$arr = array();
foreach($temp as $p => $n)
$arr[] = array('num'=>$n, 'period'=>$p);
print_r($arr);
$tmp = array();
foreach( $arr as $one)
{
if( $tmp[$one['period']] )
$tmp[$one['period']] = $tmp[$one['period']] + $one['num'];
else
$tmp[$one['period']] = $one['num'];
}
$arr = array();
foreach ( $tmp as $key => $value )
$arr[] = array( 'num' => $value , 'period' => $key );
function merge($items){
$data = array();
foreach ($items as $v) {
$p = $v['period'];
if(array_key_exists($p, $data)){
$data[$p]['num'] += $v['num'];
}else{
$data[$p] = array('num'=>$v['num'],'period'=>['period']);
}
}
return $data = array_values($data);
}
$arr1 = array(
array('num'=>5,'period'=>3),
array('num'=>10,'period'=>3),
array('num'=>15,'period'=>9)
);
$arr2 = array();
foreach($arr1 as $k1 => $v1) {
if(empty($arr2)) {
$arr2[] = $v1;
} else {
foreach ($arr2 as &$v2) {
if($v1['period'] == $v2['period']) {
$v2['num'] += $v1['num'];
} else {
$arr2[] = $v1;
}
}
}
}
5, 'period'=>3),
array('num'=>10,'period'=>3),
array('num'=>15,'period'=>9)
);
$result = array();
$arr = array_reduce($arr, function($prev, $val) use (&$result) {
if (empty($prev)) {
return $val;
}
if (isset($prev['period']) && $prev['period'] === $val['period']) {
$prev['num'] += $val['num'];
} else {
$result[] = $val;
$prev = array();
}
empty($prev) || $result[] = $prev;
return $prev;
}, array());
print_r($result);
$arr = array(
array('num'=>5,'period'=>3),
array('num'=>10,'period'=>3),
array('num'=>15,'period'=>9)
);
$keyvalue = [];
array_filter(
$arr,
function ($item) use (&$keyvalue) {
if (array_key_exists($item['period'], $keyvalue)) {
$keyvalue[$item['period']] = [
'period' => $item['period'],
'num' => $item['num'] + $keyvalue[$item['period']]['num']
];
return false;
} else {
$keyvalue[$item['period']] = [
'period' => $item['period'],
'num' => $item['num']
];
return true;
}
}
);
var_dump(array_values($keyvalue));
感觉这样可能简单点。