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Home Backend Development PHP Tutorial 请教各位老师关于PHP数组的问题

请教各位老师关于PHP数组的问题

Jun 23, 2016 pm 01:51 PM
php array teacher

各位老师,初学PHP,有些问题百度找不到,便来这里请教,还望各位老师多多包涵与帮助,感激不尽。

我现在遇到的问题是这样的:
通过一个MYSQL命令,得到一个列表,并将这个列表存到一个数组。

                //定义日期数组                $search_date=array();		//进入FOR循环,从开始时间循环到结束时间                //转化为UNIX时间戳进行操作		for($i=strtotime($start_time);$i<strtotime($stop_time)+86400;$i+=86400)		{                    $search_date_num =  date('Y-m-d', $i);                    $search_date[]= $search_date_num;		}
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通过上面的代码,得到一个search_date的数组。里面可能有2个以上的数据。都是世界,比如
array ([0]>='2014-08-10' [1]>='2014-08-11')

现在的问题就是,如果我通过foreach ($search_date as $v){
}
这样的逻辑去数据里面取数据。

会取到
Array ( [0] => 16777221 [1] => 16777222  ) Array ( [0] => 16777221 [1] => 16777222  ) 
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这样的数据,不是一个完整的数组。
每次循环都是形成了一个新的数组。
有没有办法将循环得到的所有数据存成一个大的1维或者2维的数组呢,而不是每次循环都是得到一个数组呢?


回复讨论(解决方案)

$newArr= array();$search_date = array(0=>'2014-08-10' ,1=>'2014-08-11');$num = 0;foreach ($search_date as $k => $v){    $newArr[$num][$k] = $v;    $num++;}var_dump($newArr);
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写着玩的你可以看下思路然后自己去组装。

不太明白你的意思
请在说的清楚一点

xuzuning老师。

是有一个1维数组A,值是日期。
然后我通过foreach A这个数组。
将A的值作为条件去数据库取另一些值,这些值是一个列表,可能有几十个甚至几万个。
我需要将取到的值按顺序存为一个1维的数组。

现在遇到的问题是:
当日期是1时,取到数值列表并存进数组C;
当日期为2时,又取到一份C。

这时,打印C这个数组,数组变成了非1维数组,而是有两个数组。
如果将C变成一个1维数组,并将多次循环的结果都存进这一个数组?

你是怎么把结果保存到数组的?

$log_id = array(); foreach ($search_date as $v)                 {                    //查询当日所有符合条件的id                     $sql = "Select distinct log_id from $s where DATE(log_time)='".$v."'";                    $result=mysql_query($sql,$link);                    //通过一个循环将值存入                    while($arr = mysql_fetch_assoc($result))					{                        $log_id [] = $arr['log_id '];                    }
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那么 foreach 结束的时候,$log_id 不就是个一维数组吗?

是呀。可是每次循环都会生成一个1维数组。这样10次循环就有了10个1维数组。
我想要将10次循环的结果存到一个1维数组里面去。
请问有什么方法吗?

那你并没贴全这部分代码呀,我怎么知道你又做了什么?

不好意思,我贴全一点。

//定义日期数组$search_date=array();//进入FOR循环,从开始时间循环到结束时间 //转化为UNIX时间戳进行操作for($i = strtotime($start_time); $i < strtotime($stop_time)+86400;$i+= 86400){       $search_date_num =  date('Y-m-d', $i);       $search_date[]= $search_date_num;}//以上,会得到数组$search_date//格式为:Array ( [0] => 2014-07-21 [1] => 2014-07-22 )//然后:$log_id = array();$s =' s11';foreach ($search_date as $v)  {         //查询当日所有符合条件的id         $sql = "Select distinct log_id from $s where DATE(log_time)='".$v."'";         $result=mysql_query($sql,$link);         //通过一个循环将值存入         while($arr = mysql_fetch_assoc($result))	{                $log_id [] = $arr['log_id '];        }
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然后我
print_r($log_id );
得到以下数组:
Array ( [0] => 16777221 [1] => 16777222 [2] => 16777223) Array ( [0] => 26777221 [1] => 26777222 [2] => 26777223) 
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而我想得到这样的数组:
Array ( [0] => 16777221 [1] => 16777222 [2] => 16777223 [3] => 26777221 [4] => 26777222 [5] => 26777223) 
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就你贴出的这些代码,$log_id 是不可能为二维数组的

array_merge???

不是二维数组喔,是多个1维数组,每次循环都产生了一个1维数组~~

array_merge???

 不是array_merge,array_merge() 函数把两个或多个数组合并为一个数组,你的不是这个效果。

谢谢net8386308,我要的是每次循环产生的数组都按序存入到一个数组,在某一个循环里面是只有一个1维数组的,所以这个循环里面不可能合并。也许可以传值到一个函数里面去合并?但循环的天数不固定,那个函数也不知道该如何写。


已解决,感谢各位老师的指教。

就你贴出的这些代码,$log_id 是不可能为二维数组的


LZ再仔细分析一下你的代码吧,数组操作没那么复杂,学会调试,用最蠢的"echo"方法去调试,看下你的数据在每一次循环中都发生了什么变化。 从我这里看,你的$log_id不会是一个二维数组的。除非你的$arr['log_id ']本身就是一个一维数组,你自己echo看看吧!
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