如何使用PHP数组中的值在HTML选择控件中设置多个默认值？

Question

This is sort of an extension of the problem solved here: Set default value for HTML select control in PHP however I would like to fill in Multiple values that match, with the values to fill in stored in an additional array:

This is my code so far:

<select name="genres[]" id="genres_edit" multiple>
<?php
$genrelist = array(  
'Action',  
'Adventure',
'Comedy',
'Cooking',
'War',
'Western');
for($i = 0;$i < count($genrelist);$i++) {
    echo "<option value=\"$genrelist[$i]\"";
    for ($g = 0; $g < count($genre);$g++) {
        if ($genrelist[$i] == $genre[$g]) {
            echo "selected=\"selected\"";
        }
    echo ">$genrelist[$i]</option>";
    }
}
?>
</select>

$genrelist is the array of all possible genres that will be used to fill up the select control, and the array of actual genres is stored in $genre.

Basically I want it to highlight the values in the selectbox that match any of the values in the $genre array.

i.e. if the genres stored in $genres are: Adventure, Cooking, Western, then those 3 values will be highlighted in the select box, out of the 6 available genres in the box.

Answer 1

Here's how I'd do it ...

$genres = array(
    'Action',
    'Western'
    );

$genrelist = array(
    'Action',  
    'Adventure',
    'Comedy',
    'Cooking',
    'War',
    'Western');

foreach ($genrelist as $k=>$v) {
    $sel = (array_search($v,$genres) !== false) ? ' selected' : '';
    echo '<option value="'. $k .'"'. $sel .'>'. $v .'</option>';
}

Here's the sandbox ... http://sandbox.onlinephpfunctions.com/code/e4f2ca28e0fd43513b694f5669329cc1db328598