在 html 中使用“php if”更改颜色背景

Question

I'm finishing a homework, but there is something bothering me, which is the fact that I cant change a <td></td> background color using php.

This is a code from html using some classes of php and all that stuff

<?php
<td 
<?php
if ($produtos->dtfora==1001-01-01) {
    echo "style="; background-color;darkred;"";
}
?>
>
<?php echo $produtos->dtfora; ?>
</td>

There are no error messages, it just doesn't work or change anything

Answer 1

you must do it like this:

<?php $style = 'background-color:darkred'; ?>

<td style="<?php echo $style ?>">
    // Your Content
</td>

Answer 2

There are couple small issues with this.
First, there are two opening php tags. Fixing this would turn the code into the following:

<td 
<?php
    if ($produtos->dtfora=="1001-01-01") {
        echo 'style="; background-color;darkred;"';
    }
?>
>
<?php echo $produtos->dtfora; ?>
</td>

This is still not easy to read or easy to maintain, so moving the result of the statement into a seperate variable would be ideal:

<?php
    // Define default style
    $style = "";
    // If the statement is matched, set the style variable to the custom color
    if ($produtos->dtfora=="1001-01-01") {
        $style = "background-color: darkred;";
    }
?>

<!-- Use the style variable, either empty or filled with color into the style attribute of the td -->
<td style="<?php echo $style; ?>">
    <?php echo $produtos->dtfora; ?>
</td>

Answer 3

<?php

$changeBg = "background-color:red";

?>

<td style="<?php echo $changeBg ?>">
   Email ID
<td>

Answer 4

It should be like below.

<?php
if ($produtos->dtfora=="1001-01-01") {
    echo "style='background-color:darkred";
}

Answer 5

for this you can simple using a class for this and add this class according to your condition. example:

<style>
.productos_td: {background-color:darkred;}
</style>
<?php
if ($produtos->dtfora==1001-01-01) { ?>
<td class="productos_td">
<?php } else{ ?> <td> <?php } ?>
</td>