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How to have a multiple-select box that stays selected after submit

How to have a multiple-select box that stays selected after submit

<?php 
function inList($needle, $haystack) 
{     
    while (list($k, $v) = each($haystack)) 
    { 
      if ($needle == $v) return true; 
    } 
    return false; 
} 
     
function selectBox($size, $name, $matchArray) 
{ 
    echo "<select multiple name='".$name."[]' size='".$size."'>\n"; 
    for ($x = 0; $x < 5; $x++) 
    { 
        echo "\t<option value='key".$x."'"; 
        if (inList("key".$x, $matchArray)) echo " SELECTED"; 
        echo ">Value ".$x."\n"; 
    } 
    echo "</select>"; 
} //selectBox() 
      


$num_selected = count($sel); 
print "<P>Number of Values selected: $num_selected<p>\n"; 
if ($num_selected) 
{ 
    echo "<P>while list version<BR>\n"; 
    while (list($k, $v) = each($sel)) 
    {  echo "sel[".$k."] == ".$v."<BR>\n";    } 
} 
?> 

<form method="post"> 
<?php selectBox(6,sel,$sel); ?> 
<br> 
<input type=submit value="Submit"> 
</form> 

</BODY></HTML>

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