Ändern Hintergrundfarbe mit if-Anweisung in PHP

Question

Wenn time2 größer ist als Zeit 1 Ich möchte die Hintergrundfarbe zu rot ändern. Ich bin ein total noob in diesem und ich versuchte es jetzt seit Tagen, aber es nicht zur Arbeit. In CSS Ich habe .bgred {background: red;}

<?php 
$sql = ("SELECT name, time1, time2 FROM myTable WHERE dates LIKE '".$_POST['dat']."' "); 
$result = mysqli_query($conn, $sql);   

if (mysqli_num_rows($result) > 0) {  

    echo "<table action='' method='POST'><tr> 
    <th>Name</th> 
    <th>Time1</th> 
    <th>Time2</th></tr>"; 

    // output data of each row 
    while($row = mysqli_fetch_assoc($result)) { 

     $var1 = $row["time1"]; 
     $var2 = $row["time2"]; 
     if($var2 < $var1) { 
      $bgred = 'class="bgred"'; 
     } else { 
      $bgred = ''; 
     } 

     echo "<tr><td>".$row["name"]."</td> 
     <td>".$row["time1"]."</td> 
     <td class="$bgred">".$row["time2"]."</td></tr>"; 
     } 
    } 

    echo "</table>"; 

mysqli_close($conn); 
?> 

Answer 1

$bgred = null; 
$rows = null; 

while($row = mysqli_fetch_assoc($result)) {  


    $var1 = $row["time1"]; 
    $var2 = $row["time2"]; 
    if($var2 < $var1) { 
     $bgred = 'class="bgred"';  
    } else { 
     $bgred = ''; 
    } 

    $rows .= '<tr> 
        <td>' . $row["name"] . '</td> 
        <td>' . $row["time1"] . '</td> 
        <td>' . $row["time2"] . '</td> 
      </tr>'; 
} 

echo '<table action="" method="POST"> 
     <tr> 
      <th>Name</th> 
      <th>Time1</th> 
      <th class="' . $bgred . '">Time2</th> 
     </tr> 
     ' . $rows . ' 
    </table>'; 

Haben Sie einen Grund haben doppelte Anführungszeichen zu benutzen?

Answer 2

Du Echo überall bgred $ nicht aus.

<?php 
$sql = ("SELECT name, time1, time2 FROM myTable WHERE dates LIKE '".$_POST['dat']."' "); 
$result = mysqli_query($conn, $sql); 

if (mysqli_num_rows($result) > 0) { 

echo "<table action='' method='POST'><tr> 
<th>Name</th> 
<th>Time1</th> 
<th>Time2</th></tr>"; 

// output data of each row 
while($row = mysqli_fetch_assoc($result)) {  


    $var1 = $row["time1"]; 
    $var2 = $row["time2"]; 

//edited here 
    if(strtotime($var2) < strtotime($var1)) { 
     $bgred = 'bgred'; 
//done with edit  
    } else { 
     $bgred = ''; 
    } 

    echo "<tr><td class='$bgred'>".$row["name"]."</td> 
    <td class='$bgred'>".$row["time1"]."</td> 
    <td class='$bgred'>".$row["time2"]."</td></tr>";  
    }  
}  

echo "</table>"; 
mysqli_close($conn); ?>