How to set multiple select options by default from array

I'm trying to retrieve options/values from my database in the from of an array i would like to set these option/values as selected by default in a multiple select list and display them to the user where they will be able to updated their data if necessary.

//data in database
$mytitle = array(
    'Arbitrator',
    'Attorney',
    'Student',
    'Other'
); 

//data f开发者_高级运维or multiple select
$title = array(
    'Judge' ,
    'Magistrate' ,
    'Attorney' ,
    'Arbitrator',
    'Title Examiner' ,
    'Law Clerk','Paralegal' ,
    'Intern' ,
    'Legal Assistant',
    'Judicial Assistant',
    'Law Librarian' ,
    'Law Educator' ,
    'Attorney',
    'Student',
    'Other'
);

echo "<select name='title[]' multiple='multiple'>";

$test = implode(',', $mytitle);

for ($i=0; $i<=14; $i++) {
    if($test == $title[$i]) {
        echo "<option selected value='$title[$i]'>$title[$i]</option>";
    }
    else {
        echo "<option value='$title[$i]'>$title[$i]</option>";
    }
}

echo "</select>"; 

I think you may have a logic error. Try this as your loop:

foreach ($title as $opt) {
    $sel = '';
    if (in_array($opt, $mytitle)) {
        $sel = ' selected="selected" ';
    }
    echo '<option ' . $sel . ' value="' . $opt . '">' . $opt . '</option>';
}

Use the in_array() function.

for ($i=0; $i<=14; $i++) {
  if(in_array($title[$i], $mytitle)){
    echo "<option selected value='$title[$i]'>$title[$i]</option>";
  }else {
    echo "<option value='$title[$i]'>$title[$i]</option>";
  }
}

Very simple with the help of jQuery where the select has the id test

$('#test option').attr('selected', 'selected');

JSFiddle Example