while函数和if语句在WordPress中返回错误

Question

I am using the following code to list all the posts in my wordpress website and I am trying to call "selected" if the ID is the current cone selected but strangely it's calling the if statement 3 times rather than once even though all the ID's are different.

My Code:

function test($id) {
    // The Query
    query_posts( array ('posts_per_page' => -1 ) );
    // The Loop
     while ( have_posts() ) : the_post(); 
     if ($id == get_the_ID()) { $selected = " selected"; }
     ?>
    <option value="<?php echo get_the_ID(); ?>"<?php echo $selected; ?>><?php echo get_the_title() ?></option><?php echo "
"; ?>
    <?php endwhile;
    // Reset Query
    wp_reset_query();
    }

My Output:

<select name="w_url">
<option value="493">TEST 1</option>
<option value="390">TEST 2</option>
<option value="388" selected>Test 3</option>
<option value="386" selected>Test 4</option>
<option value="384" selected>Test 5</option>
</select>

I did select the third option and so it is showing that one correctly but carries on to the 4th and 5th. I'm sure its something simple but I can't see it

Answer 1

After your variable $selected gets the value "selected", it doesn't change value in futher iterations. You should use something like

if ($id == get_the_ID()) { 
    $selected = " selected"; 
} else { 
    $selected = ""; 
}