10c05-2.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 59 行

<?php
// If this file was a submission, then output the values
if (count($_POST)) {
    echo "<p>You submitted the following music ID numbers:<br />
1st - {$_POST['1st']}, 2nd - {$_POST['2nd']}, 3rd - {$_POST['3rd']}</p>
";
}

// Create a function that will take an ID, and an array of ID's & Desc's as 
// parameters, and will output the options of a select list with the
// proper one highlighted.
function create_option_list($id, $data) {
    // The blank option - automatically selected if nothing else is
    $options = "<option value=\"\">Select one ...</option>\n";
    
    // Now loop over all possibilities, adding them in:
    foreach ($data as $x) {
        // Determine if this one should be selected
        $sel = ($id == $x['id']) ? ' selected' : '';
        
        // Now add in the option
        $options .= 
            "<option value=\"{$x['id']}\"{$sel}>{$x['desc']}</option>\n";
    }

    // Now return the option list
    return $options;
}

// Array of options in a format that might have come from a database query:
$types = array(
    array('id' => 10, 'desc' => 'Rock'), 
    array('id' => 11, 'desc' => 'Alternative'),
    array('id' => 12, 'desc' => 'Metal'), 
    array('id' => 20, 'desc' => 'Classical'),
    array('id' => 33, 'desc' => 'Jazz'), 
    array('id' => 34, 'desc' => 'Blues'),
    array('id' => 42, 'desc' => 'Ska'), 
    array('id' => 44, 'desc' => 'Folk'),
    array('id' => 49, 'desc' => 'Blue Grass')
    );

// And now we can output our page, using this multiple times:
// We will use an @ in front of the $_POST references in order to suppress
//  the PHP notice that will occur due to it not being initialized at first.
?>
<form action="<?= $_SERVER['PHP_SELF'] ?>" method="post" name="f1">
<p>Please choose your favorite types of music:</p>
<p>1st: <select name="1st">
<?= create_option_list(@$_POST['1st'], $types) ?>
</select></p>
<p>2nd: <select name="2nd">
<?= create_option_list(@$_POST['2nd'], $types) ?>
</select></p>
<p>3rd: <select name="3rd">
<?= create_option_list(@$_POST['3rd'], $types) ?>
</select></p>
<p><input type="submit" /></p>
</form>