有一个这样查询出来的数组。
$result = [ ['month'=>08,'price'=>218], ['month'=>12,'price'=>140],];
最终需要转换成一个字符串，用于前台js
格式类似：[49.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, null, null]
显示的是每月的销售情况，没有值就为null
比如一月份的price为49.9
我的做法：
感觉有点麻烦，求优化
//先构造类似 ['01'=>0,'02'=>0 .... '12'=>0] 这种格式的数组 $fullMonth = []; for($i=1;$i<=12;$i++){ $fullMonth[str_pad($i,2,'0',STR_PAD_LEFT)] = 0; } // 遍历数组 对应月份有值就放到新建的数组里 $i = 0; foreach($fullMonth as $month=>$value){ foreach($result as $record){ if($month == $record['month']){ $fullMonth[$month] = $record['price']; } } $i++; } return '[' . implode(',',$fullMonth) . ']';
回复讨论(解决方案)
为什么不用json格式？
$result = [ ['month'=>08,'price'=>218], ['month'=>12,'price'=>140],];echo json_encode($result); // [{"month":0,"price":218},{"month":12,"price":140}] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title> New Document </title> </head> <body> <?php $result = [ ['month'=>08,'price'=>218], ['month'=>12,'price'=>140], ]; ?> <div id="result"></div> <script type="text/javascript"> var result = <?php echo json_encode($result); ?>; var tmp = ''; for(var i=0; i<result.length; i++){ tmp += result[i].month + ' = ' + result[i].price + '<br>'; } document.getElementById('result').innerHTML = tmp; </script> </body></html>
$r = array_fill(0, 12, null);$result = [ ['month'=> '08', 'price'=> 218], ['month'=> '12', 'price'=> 140],];foreach($result as $v) { $r[$v['month'] - 1] = $v['price'];}echo json_encode($r); [null,null,null,null,null,null,null,218,null,null,null,140]
进一步询问
已知
$res = [[y=>'2014-12-03','item'=>263],[y=>'2014-12-04','item'=>168]];
让变成如下格式
[ {y: '2014-12-01', item: null}, {y: '2014-12-02', item: null}, {y: '2014-12-03', item: 263}, {y: '2014-12-04', item: 168}, {y: '2014-12-05', item: null}, ..... {y: '2014-12-31', item1:null},] y加上引?，??才不?有notice
<?php$res = [['y'=>'2014-12-03','item'=>263],['y'=>'2014-12-04','item'=>168]];echo json_encode($res, JSON_PRETTY_PRINT);?>
[ { "y": "2014-12-03", "item": 263 }, { "y": "2014-12-04", "item": 168 }] ??
<?php$res = [['y'=>'2014-12-03','item'=>263],['y'=>'2014-12-04','item'=>168]];$tmp = array();foreach($res as $v){ $tmp[$v['y']] = $v['item'];}$start = 1;$end = 31;$result = array();for($i=$start; $i<=$end; $i++){ $key = date('Y-m-d',strtotime('2014-12-'.$i)); $item = null; if(isset($tmp[$key])){ $item = $tmp[$key]; } array_push($result, array('y'=>$key,'item'=>$item));}echo json_encode($result, JSON_PRETTY_PRINT);?> [ { "y": "2014-12-01", "item": null }, { "y": "2014-12-02", "item": null }, { "y": "2014-12-03", "item": 263 }, { "y": "2014-12-04", "item": 168 }, { "y": "2014-12-05", "item": null }, { "y": "2014-12-06", "item": null }, { "y": "2014-12-07", "item": null }, { "y": "2014-12-08", "item": null }, { "y": "2014-12-09", "item": null }, { "y": "2014-12-10", "item": null }, { "y": "2014-12-11", "item": null }, { "y": "2014-12-12", "item": null }, { "y": "2014-12-13", "item": null }, { "y": "2014-12-14", "item": null }, { "y": "2014-12-15", "item": null }, { "y": "2014-12-16", "item": null }, { "y": "2014-12-17", "item": null }, { "y": "2014-12-18", "item": null }, { "y": "2014-12-19", "item": null }, { "y": "2014-12-20", "item": null }, { "y": "2014-12-21", "item": null }, { "y": "2014-12-22", "item": null }, { "y": "2014-12-23", "item": null }, { "y": "2014-12-24", "item": null }, { "y": "2014-12-25", "item": null }, { "y": "2014-12-26", "item": null }, { "y": "2014-12-27", "item": null }, { "y": "2014-12-28", "item": null }, { "y": "2014-12-29", "item": null }, { "y": "2014-12-30", "item": null }, { "y": "2014-12-31", "item": null }] 
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