我如何把它变成一个 php 字符串并将其回显到<select>?

Question

This makes me crazy I cant get it to work.

This is what ive done:

$v = "<?php if($test== 'lala' || $test== 'kaka'){echo selected='selected';}?>";
$b = "<?php if($test== 'tada' || $test== 'sada'){echo selected='selected';}?>";

<select>
      <option <?php echo $v; ?> value="lala">lala</option>
        <option  <?php echo $b; ?> value="tada">tada</option>
</select>

in the dropdown this gives me: value="tada">tada and it should only be tada

Answer 1

Your quotes are messed up.

Change:

    $v = "<?php if($test== 'lala' || $test== 'kaka'){echo selected='selected';}?>";
$b = "<?php if($test== 'tada' || $test== 'sada'){echo selected='selected';}?>";

To:

<option <?php if($test== 'lala' || $test== 'kaka'){echo 'selected=selected';}?> value="lala">lala</option>
<option  <?php if($test== 'tada' || $test== 'sada'){echo 'selected=selected';} ?> value="tada">tada</option>