php定义二维数组以及和JavaScript传递json数据

php定义二维数组及将二维数组转换为json格式的方法如下，在getoildata.php文件中

$arr = array(array(
'oildate' => '2014-09-01',
'oidproduction' => '12.56',)
);
$arr[1]['oildate']='2014-09-02';
$arr[1]['oidproduction']='12.78';  //后面可以继续按照自己的需求增加数组的内容
$json_str = json_encode($arr);
return $json_str;

JavaScript获得数据之后对其进行解析

$.post('getoildata.php', formValues, function(data) {
//alert(data);
var arr =  JSON.parse(data);
for(var i=0;i<arr.length;i++)
{
alert (arr[i].oildate);
alert (arr[i].oidproduction);
}
}

=======================

php还有一种简单的定义方法，在初始化的时候不定义，在后面进行第二维的定义，本例中添加了‘oildate和oilproduction及waterperday三个

$arr = array(array());
$oilperday = [12.57,13.25,14.21,14.98,15.44,15.67,16.12,17.24,17.68,18.36,null,null,null,16.53,16.11,16.06,15.54,15.02,14.71,14.28,13.51,13.03,12.59,12.18,11.58,11.26,10.82,10.16,9.76,9.36];
$waterperday = [17.46,17.93,19.30,22.40,22.06,20.96,23.03,25.06,25.76,27.23,null,null,null,25.11,24.63,24.12,23.65,23.17,22.70,22.65,21.58,20.94,20.30,19.70,19.10,18.54,17.97,17.44,16.91,16.40];
$count=count($oilperday);

for($i=0;$i<$count;$i++)
{
$datetemp = '2014-09-'. $i;
$arr[$i]['oildate']=$datetemp;
$arr[$i]['oidproduction']=$oilperday[$i];
$arr[$i]['waterperday'] = $waterperday[$i];
}

==================================

注意，上述定义有些环境下需要修改；

$oilperday = [12.57,13.25,14.21,14.98,15.44,15.67,16.12,17.24,17.68,18.36,null,null,null,16.53,16.11,16.06,15.54,15.02,14.71,14.28,13.51,13.03,12.59,12.18,11.58,11.26,10.82,10.16,9.76,9.36];

这种定义方式在有些操作系统下是不行的，比如win8下面就会出错

按照下面修改一下就可以了

$oilperday =array(12.57,13.25,14.21,14.98,15.44,15.67,16.12,17.24,17.68,18.36,null,null,null,16.53,16.11,16.06,15.54,15.02,14.71,14.28,13.51,13.03,12.59,12.18,11.58,11.26,10.82,10.16,9.76,9.36);