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;

  $.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];

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);