Question

我正在尝试根据文章发表时的《泰晤士报》对结果进行分组（就像newsnow网站汇总一样）

我的PHP代码如下：

 $sql="SELECT articles.id, name, title, description, timestamp 
        FROM articles 
        LEFT JOIN sources ON `articles`.`source_id` = `sources`.`id` 
        ORDER BY timestamp 
        DESC LIMIT 25";
$result = mysqli_query($db,$sql);

while($row = mysqli_fetch_array($result)) {
$currentTime = time();
$articletimes = $row['timestamp'];
$timedifference = $currentTime - $articletimes;  


switch (true) {
case ($timedifference < 300):
    echo "<br/>Less than 5 minutes ago <br/>";
    echo "$row['title']";
    break;
case ($timedifference < 900 && $timedifference > 300):
    echo "<br/>15 Mins ago <br/>";
    echo "$row['title']";
    break;
case ($timedifference < 1800 && $timedifference > 900):
    echo "<br/>30 mins ago <br/>";
    echo "$row['title']";
    break;
case ($timedifference < 3600 && $timedifference > 1800):
    echo "<br/>about an hour ago <br/>";
    echo "$row['title']";
                }

}

} mysqli_close($db);

当前，上面的代码显示如下：

Less than 5 minutes ago
Article Name A
Less than 5 minutes ago
Article Name B
Less than 5 minutes ago
Article Name C
30 mins ago
Article Name D
30 mins ago
Article Name E

有没有一种方法可以按文章的发布时间对其进行分组（例如：）

Less than 5 minutes ago
Article Name A
Article Name B
Article Name C
30 mins ago
Article Name D
Article Name E

非常感谢：）

Answer 1

您必须将所有访问过的案例信息存储在数组或变量中。当前的解决方案。

$visitedCase = [];
while($row = mysqli_fetch_array($result)) {
    $currentTime = time();
    $articletimes = $row['timestamp'];
    $timedifference = $currentTime - $articletimes;  

    switch (true) {
        case ($timedifference < 300):
            if(!(in_array(1, $visitedCase)) {
                echo "<br/>Less than 5 minutes ago <br/>";
                $visitedCase[] = 1;
            }
            break;
        case ($timedifference < 900 && $timedifference > 300):
            if(!(in_array(2, $visitedCase)){
                echo "<br/>15 Mins ago <br/>";
                $visitedCase[] = 2;
            }   
            break;
        case ($timedifference < 1800 && $timedifference > 900):
            if(!(in_array(3, $visitedCase)){
                echo "<br/>30 mins ago <br/>";
                $visitedCase[] = 3;
            }                               
            break;
        case ($timedifference < 3600 && $timedifference > 1800):
            if(!(in_array(4, $visitedCase)){
                echo "<br/>about an hour ago <br/>";
                $visitedCase[] = 4;
            }                    
    }
    echo $row['title'];

}

Answer 2

您可以使用标志来识别是否是第一次开关=>

$i = 0;
$j = 0;
$k = 0;
while($row = mysqli_fetch_array($result)) {
$currentTime = time();
$articletimes = $row['timestamp'];
$timedifference = $currentTime - $articletimes;

switch (true) {
case ($timedifference < 300):
    if($i == 0){
     echo "<br/>Less than 5 minutes ago <br/>";
     $i++;
    }
    echo "$row['title']";
    break;
case ($timedifference < 900 && $timedifference > 300):
    if($j == 0){
     echo "<br/>15 Mins ago <br/>";
     $j++;
    }
    echo "$row['title']";
    break;
case ($timedifference < 1800 && $timedifference > 900):
    if($k == 0){
     echo "<br/>30 mins ago <br/>";
     $k++;
    }
    echo "$row['title']";
    break;
case ($timedifference < 3600 && $timedifference > 1800):
    echo "<br/>about an hour ago <br/>";
    echo "$row['title']";
                }

}

}

Answer 3

如果要使用PHP进行操作，则必须记住您已经输出了标题行，因此每个分组只进行一次

$sql="SELECT articles.id, name, title, description, timestamp 
        FROM articles 
        LEFT JOIN sources ON `articles`.`source_id` = `sources`.`id` 
        ORDER BY timestamp 
        DESC LIMIT 25";
$result = mysqli_query($db,$sql);

while($row = mysqli_fetch_array($result)) {
    $currentTime = time();
    $articletimes = $row['timestamp'];
    $timedifference = $currentTime - $articletimes;  

    $done = ['d300'=>false,'d900'=>false,'d1800'=>false,'d3600'=>false];

    switch (true) {
        case ($timedifference < 300):
            if ( !$done['d300'] ) {
                echo "<br/>Less than 5 minutes ago <br/>";
                $done['d300'] = true;
            }
            echo "$row['title']";
            break;
        case ($timedifference < 900 && $timedifference > 300):
            if ( !$done['d900'] ) {
                echo "<br/>15 Mins ago <br/>";
                $done['d900'] = true;
            }
            echo "$row['title']";
            break;
        case ($timedifference < 1800 && $timedifference > 900):
            if ( !$done['d1800'] ) {
                echo "<br/>30 mins ago <br/>";
                $done['d1800'] = true;
            }
            echo "$row['title']";
            break;
        case ($timedifference < 3600 && $timedifference > 1800):
            if ( !$done['d3600'] ) {
                echo "<br/>about an hour ago <br/>";
                $done['d3600'] = true;
            }
            echo "$row['title']";
            break;
    }
}

Answer 4

这是可以根据需要显示输出的代码。

$sql="SELECT articles.id, name, title, description, timestamp FROM articles 
    LEFT JOIN sources ON `articles`.`source_id` = `sources`.`id` 
    ORDER BY timestamp DESC LIMIT 25";
$result = mysqli_query($db,$sql);

while($row = mysqli_fetch_array($result)) {
    $currentTime = time();
    $articletimes = $row['timestamp'];
    $timedifference = $currentTime - $articletimes;  

    $td_3 = $td_9 = $td_18 = $td_36 = 0;

    switch (true) {
            case ($timedifference < 300):
                if($td_3 == 0){
                    echo "<br/>Less than 5 minutes ago <br/>";  
                }   
                $td_3 = 1;
                echo "$row['title']";
                break;
            case ($timedifference < 900 && $timedifference > 300):
                if($td_9 == 0){
                    echo "<br/>15 Mins ago <br/>";  
                }   
                $td_9 = 1;
                echo "$row['title']";
                break;
            case ($timedifference < 1800 && $timedifference > 900):
                if($td_18 == 0){
                    echo "<br/>30 mins ago <br/>";  
                }
                $td_18 = 1;
                echo "$row['title']";
                break;
            case ($timedifference < 3600 && $timedifference > 1800):
                if($td_36 == 0){
                    echo "<br/>about an hour ago <br/>";
                }
                $td_36 = 1;
                echo "$row['title']";
        }
}

开关盒内的While循环-分组结果

4 个答案: