Php Array key =>值搜索

Question

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我對php很新。

我有一個陣列

$ arr = array（0 => array（'GID'=> 1，'groupname'=>“cat1”，'members'=> array（0 => array（'mid'=> 11，'mname'=> 'wwww'），1 => array（'mid'=> 12，'mname'=>'wswww'））），1 => array（'GID'=> 2，'groupname'=>“cat2”， '部件'=>數組（0 =>數組（ '中'=> 13， 'MNAME'=> 'gggwwww'），1 =>數組（ '中'=> 14， 'MNAME'=> 'wvvwww'） ）），2 => array（'GID'=> 3，'groupname'=>“cat1”，'members'=> array（0 => array（'mid'=> 15，'mname'=>'wwddsww '）），1 =>數組（' 中 '=> 16，' MNAME '=>' wwwdddw'）））;

      ie...,I have GID,groupname,mid(member id),mname(member name).I want to insert a new mid and mname into a group if it is already in the array ,if it is not exists then create a new subarray with these elements..I also need to check a member id(mid) is also present.........................I used the code but its not working fine............. if (!empty($evntGroup)) {


            foreach ($evntGroup as $k => $group) {

                if ($group['GID'] == $group_id) {
                    foreach($group as $j=> $mem){

                    if($mem['mid'] == $mem_id){

                        unset($evntGroup[$k]['members'][$j]['mid']);
                        unset($evntGroup[$k]['members'][$j]['mname']);
                    }
                    else{


                    $evntGroup[$k]['members'][] = array(
                        'mid' => $mem_id,
                        'mname' => $mem_name);

                    }}
                } else {


                    $evntGroup[] = array(
                        'GID' => $group_id,
                        'groupname' => $Group['event_group_name'],
                        'members' => array(
                            0 => array(
                                'mid' => $mem_id,
                                'mname' => $mem_name
                            )
                        )
                    );

                }

            }
        } else {

            $evntGroup[$i]['GID'] = $group_id;
            $evntGroup[$i]['groupname'] = $Group['event_group_name'];
            $evntGroup[$i]['members'][] = array(
                'mid' => $mem_id,
                'mname' => $mem_name);
            $i++;

        }

Answer 1

以函數的形式，最簡單的解決方案將如下所示：

function isGidInArray($arr, $val) {
    foreach($arr as $cur) {
        if($cur['GID'] == $val)
            return true;
    }
    return false;
}

您已經更新了問題，以指定在找到指定的GID時您想要執行的操作，但這只是對循環的一個簡單補充：

function doSomethingIfGidInArray($arr, $val) {
    foreach($arr as $cur) {
        if($cur['GID'] == $val) {
            doSomething();
            break; //Assuming you only expect one instance of the passed value - stop searching after it's found
        }
    }
}

遺憾的是，沒有本機PHP數組函數將檢索父數組中每個數組的相同索引。 我經常想要這樣的東西。

Answer 2

如果GID等於3，這樣的東西將匹配：

foreach( $arr as $item ) {
  if( $item['GID'] == 3 ) {
     // matches
  }
}

Answer 3

有代碼

function updateByGid(&$array,$gid,$groupname,$mid,$mname) {
    //For each element of the array
    foreach ($array as $ii => $elem) {
        //If GID has the same value
        if ($elem['GID'] == $gid) {
            //Insert new member
            $array[$ii]['members'][]=array(
                        'mid'=>$mid,
                        'mname'=>$mname);
            //Found!
            return 0;
        }
    }       
    //If not found, create new
    $array[]=array(
            'GID'=>$gid,
            'groupname'=>$groupname,
            'members'=>array(
                0=>array(
                    'mid'=>$mid,
                    'mname'=>$mname
                )
            )
    );

    return 0;
}