Question

我知道我的问题看起来有点不可理解但在这里我会解释一下。

我有3张桌子，这里是

我在这里有一个PHP代码，输出是基于查询创建一个数组，在这里。

<?php
    require 'conn.php';

    //Array Collectors
    $arr_tblsrce1 = array();
    $arr_tblsrce2 = array();
    $arr_tbldest  = array();

    //Main Query
    $rs_tbldest = mysqli_query($con, 'SELECT appkey FROM tbl_destination');
    while ($rw_tbldest = mysqli_fetch_assoc($rs_tbldest)) {
        $arr_tbldest[] = $rw_tbldest['appkey'];
    }

    //Do the Following procedures during the loop of Main Query Array
    //for ($i=0; $i < count($arr_tbldest); $i++) { 
    foreach ($arr_tbldest as $main_appkey) {

        //Create an array from tbl_source1
        $rs_tblsrce1 = mysqli_query($con,"SELECT name FROM tbl_source1 WHERE appkey = '" .$main_appkey. "'");
        while ($rw_tblsrce1 = mysqli_fetch_assoc($rs_tblsrce1)) {
            $arr_tblsrce1[] =  $rw_tblsrce1['name'];
        }

        //Create an array from tbl_source2
        $rs_tblsrce2 = mysqli_query($con,"SELECT add1 FROM tbl_source2 WHERE appkey = '" .$main_appkey. "'");
        while ($rw_tblsrce2 = mysqli_fetch_assoc($rs_tblsrce2)) {
            $arr_tblsrce2[] = $rw_tblsrce2['add1'];
        }

        //Get count from the Queries.
        $cnt_tblsrce1 = mysqli_num_rows($rs_tblsrce1);
        $cnt_tblsrce2 = mysqli_num_rows($rs_tblsrce2);

        //Check and get who has the largest number between arrays (actually its mysql_num_rows).
        $newarr_length = max($cnt_tblsrce1,$cnt_tblsrce2);

        //Change the size of each array and put nulls on additional empty rows.
        $arr_tblsrce1 = array_pad($arr_tblsrce1,$newarr_length,'Empty');
        $arr_tblsrce2 = array_pad($arr_tblsrce2,$newarr_length,'Empty');
    }

    print_r($arr_tblsrce1);
    echo "<br>";
    print_r($arr_tblsrce2);
    echo "<br>";

    mysqli_close($con);
?>

我唯一的问题是如何让这些数组长度相同？查看包含max和array_pad

的部分

这是输出

Array ( [0] => Person 1 [1] => Person 1 [2] => Person 1 [3] => Person 1 [4] => Person 2 ) Array ( [0] => Address 1 [1] => Address 2 [2] => Empty [3] => Empty )

TYSM

Answer 1

<强>问题：您的代码之所以能够正常工作，是因为它在循环结束时替换了此$arr_tblsrce1变量的值。让我们说根据您的表格的最后一个值是456。

这个值只是 1 。

$rs_tblsrce1 = mysqli_query($con,"SELECT name FROM tbl_source1 WHERE appkey = '" .$main_appkey. "'");

，第二个是 0 ：

$rs_tblsrce2 = mysqli_query($con,"SELECT add1 FROM tbl_source2 WHERE appkey = '" .$main_appkey. "'");

<强>解决方案：在您的代码中替换此

//Get count from the Queries.
$cnt_tblsrce1 = mysqli_num_rows($rs_tblsrce1);
$cnt_tblsrce2 = mysqli_num_rows($rs_tblsrce2);

用这个

//Get count from the Queries.
$cnt_tblsrce1 = count($arr_tblsrce1);
$cnt_tblsrce2 = count($arr_tblsrce2);

并将此代码放在foreach循环之外

//Get count from the Queries.
$cnt_tblsrce1 = count($arr_tblsrce1);
$cnt_tblsrce2 = count($arr_tblsrce2);

//Check and get who has the largest number between arrays (actually its mysql_num_rows).
$newarr_length = max($cnt_tblsrce1,$cnt_tblsrce2);

//Change the size of each array and put nulls on additional empty rows.
$arr_tblsrce1 = array_pad($arr_tblsrce1,$newarr_length,'Empty');
$arr_tblsrce2 = array_pad($arr_tblsrce2,$newarr_length,'Empty');

以下是整个代码：

require 'conn.php';

//Array Collectors
$arr_tblsrce1 = array();
$arr_tblsrce2 = array();
$arr_tbldest  = array();

//Main Query
$rs_tbldest = mysqli_query($con, 'SELECT appkey FROM tbl_destination');
while ($rw_tbldest = mysqli_fetch_assoc($rs_tbldest)) {
    $arr_tbldest[] = $rw_tbldest['appkey'];
}

//Do the Following procedures during the loop of Main Query Array
//for ($i=0; $i < count($arr_tbldest); $i++) { 
foreach ($arr_tbldest as $main_appkey) {

    //Create an array from tbl_source1
    $rs_tblsrce1 = mysqli_query($con,"SELECT name FROM tbl_source1 WHERE appkey = '" .$main_appkey. "'");
    while ($rw_tblsrce1 = mysqli_fetch_assoc($rs_tblsrce1)) {
        $arr_tblsrce1[] =  $rw_tblsrce1['name'];
    }
    //4


    //Create an array from tbl_source2
    $rs_tblsrce2 = mysqli_query($con,"SELECT add1 FROM tbl_source2 WHERE appkey = '" .$main_appkey. "'");
    while ($rw_tblsrce2 = mysqli_fetch_assoc($rs_tblsrce2)) {
        $arr_tblsrce2[] = $rw_tblsrce2['add1'];
    }
    //2

}



//Get count from the Queries.
$cnt_tblsrce1 = count($arr_tblsrce1);
$cnt_tblsrce2 = count($arr_tblsrce2);

//Check and get who has the largest number between arrays (actually its mysql_num_rows).
$newarr_length = max($cnt_tblsrce1,$cnt_tblsrce2);

//Change the size of each array and put nulls on additional empty rows.
$arr_tblsrce1 = array_pad($arr_tblsrce1,$newarr_length,'Empty');
$arr_tblsrce2 = array_pad($arr_tblsrce2,$newarr_length,'Empty');

print_r($arr_tblsrce1);
echo "<br>";
print_r($arr_tblsrce2);
echo "<br>";

mysqli_close($con);

Answer 2

您应该尝试使用FULL JOIN查询尝试如下并适当更改，

 $rs_tblsrce12 = mysqli_query($con,"SELECT name,add1 FROM tbl_source1 t1
                              FULL JOIN tbl_source2  t2 ON t1.appkey = t2.appkey  WHERE appkey = '" .$main_appkey. "'");

        while ($rw_tblsrce1 = mysqli_fetch_assoc($rs_tblsrce12)) {
            $arr_tblsrce1[] =  $rw_tblsrce1['name'];
            $arr_tblsrce2[] = $rw_tblsrce1['add1'];

        }

Answer 3

我假设两个数组之间没有1到1的映射，为了使它们长度相同，只需在这里稍微改一下

    $newarr_length = max($cnt_tblsrce1,$cnt_tblsrce2); // returns bigger array 
    $newarr_length = count($newarr_length); // get the length

    //Change the size of each array and put nulls on additional empty rows.
    $arr_tblsrce1 = array_pad($arr_tblsrce1,$newarr_length,'Empty');
    $arr_tblsrce2 = array_pad($arr_tblsrce2,$newarr_length,'Empty');

Answer 4

尝试使用数组填充而不是数组填充

<?php
$a1=array_fill(3,4,"blue");
print_r($a1);
?>

$sizeoffirstsrc = sizeof($cnt_tblsrce1);
$sizeofsecondsrc = sizeof($cnt_tblsrce2);
$newarr_length = max(sizeoffirstsrc,sizeofsecondsrc);

//Change the size of each array and put nulls on additional empty rows.

$arr_tblsrce1 = array_fill($sizeoffirstsrc,$newarr_length,'Empty');
$arr_tblsrce2 = array_fill($sizeofsecondsrc,$newarr_length,'Empty');

在循环内部增加数组长度，使其与其他数组的大小相同

4 个答案: