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<?php

/**
* Rails Style html tag helpers
*
* These are used by the other examples to make the code
* more concise and simpler to read.
*
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://unlicense.org/
*/

/* Examples:

echo content_tag('p','Paragraph Tag', array('class'=>'foo'));

echo tag('br');
echo link_to('Hyperlink', 'http://www.example.com/?a=1&b=2');
echo tag('br');

echo form_tag();

echo label_tag('first_name').text_field_tag('first_name', 'Joe').tag('br');
echo label_tag('password').password_field_tag().tag('br');

echo label_tag('radio1_value1', 'Radio 1').radio_button_tag('radio1', 'value1').tag('br');
echo label_tag('radio1_value2', 'Radio 2').radio_button_tag('radio1', 'value2', true).tag('br');
echo label_tag('radio1_value3', 'Radio 3').radio_button_tag('radio1', 'value3').tag('br');

echo label_tag('check1', 'Check 1').check_box_tag('check1', 'value1').tag('br');
echo label_tag('check2', 'Check 2').check_box_tag('check2', 'value2', true).tag('br');
echo label_tag('check3', 'Check 3').check_box_tag('check3', 'value3').tag('br');

$options = array('Label 1' => 'value1', 'Label 2' => 'value2', 'Label 3' => 'value3');
echo label_tag('select1', 'Select Something:');
echo select_tag('select1', $options, 'value2').tag('br');

echo label_tag('textarea1', 'Type Something:');
echo text_area_tag('textarea1', "Hello World!").tag('br');

echo submit_tag();

echo form_end_tag();

*/


function tag_options($options)
{
    $html = "";
    foreach ($options as $key => $value) {
        if ($key and $value) {
            $html .= " ".htmlspecialchars($key)."=\"".
                         htmlspecialchars($value)."\"";
        }
    }
    return $html;
}

function tag($name, $options = array(), $open = false)
{
    return "<$name".tag_options($options).($open ? ">" : " />");
}

function content_tag($name, $content = null, $options = array())
{
    return "<$name".tag_options($options).">".
           htmlspecialchars($content)."</$name>";
}

function link_to($text, $uri = null, $options = array())
{
    if ($uri == null) $uri = $text;
    $options = array_merge(array('href' => $uri), $options);
    return content_tag('a', $text, $options);
}

function link_to_self($text, $query_string, $options = array())
{
    return link_to($text, $_SERVER['PHP_SELF'].'?'.$query_string, $options);
}

function image_tag($src, $options = array())
{
    $options = array_merge(array('src' => $src), $options);
    return tag('img', $options);
}

function input_tag($type, $name, $value = null, $options = array())
{
    $options = array_merge(
        array(
            'type' => $type,
            'name' => $name,
            'id' => $name,
            'value' => $value
        ),
        $options
    );
    return tag('input', $options);
}

function text_field_tag($name, $default = null, $options = array())
{
    $value = isset($_REQUEST[$name]) ? $_REQUEST[$name] : $default;
    return input_tag('text', $name, $value, $options);
}

function text_area_tag($name, $default = null, $options = array())
{
    $content = isset($_REQUEST[$name]) ? $_REQUEST[$name] : $default;
    $options = array_merge(
        array(
            'name' => $name,
            'id' => $name,
            'cols' => 60,
            'rows' => 5
        ),
        $options
    );
    return content_tag('textarea', $content, $options);
}

function hidden_field_tag($name, $default = null, $options = array())
{
    $value = isset($_REQUEST[$name]) ? $_REQUEST[$name] : $default;
    return input_tag('hidden', $name, $value, $options);
}

function password_field_tag($name = 'password', $default = null, $options = array())
{
    $value = isset($_REQUEST[$name]) ? $_REQUEST[$name] : $default;
    return input_tag('password', $name, $value, $options);
}

function radio_button_tag($name, $value, $default = false, $options = array())
{
    if ((isset($_REQUEST[$name]) and $_REQUEST[$name] == $value) or
        (!isset($_REQUEST[$name]) and $default))
    {
        $options = array_merge(array('checked' => 'checked'), $options);
    }
    $options = array_merge(array('id' => $name.'_'.$value), $options);
    return input_tag('radio', $name, $value, $options);
}

function check_box_tag($name, $value = '1', $default = false, $options = array())
{
    if ((isset($_REQUEST[$name]) and $_REQUEST[$name] == $value) or
        (!isset($_REQUEST['submit']) and $default))
    {
        $options = array_merge(array('checked' => 'checked'),$options);
    }
    return input_tag('checkbox', $name, $value, $options);
}

function submit_tag($name = '', $value = 'Submit', $options = array())
{
    return input_tag('submit', $name, $value, $options);
}

function reset_tag($name = '', $value = 'Reset', $options = array())
{
    return input_tag('reset', $name, $value, $options);
}

function label_tag($name, $text = null, $options = array())
{
    if ($text == null) {
        $text = ucwords(str_replace('_', ' ', $name)).': ';
    }
    $options = array_merge(
        array('for' => $name, 'id' => "label_for_$name"),
        $options
    );
    return content_tag('label', $text, $options);
}

function labeled_text_field_tag($name, $default = null, $options = array())
{
    return label_tag($name).text_field_tag($name, $default, $options);
}

function select_tag($name, $options, $default = null, $html_options = array())
{
    $opts = '';
    foreach ($options as $key => $value) {
        $arr = array('value' => $value);
        if ((isset($_REQUEST[$name]) and $_REQUEST[$name] == $value) or
            (!isset($_REQUEST[$name]) and $default == $value))
        {
            $arr = array_merge(array('selected' => 'selected'),$arr);
        }
        $opts .= content_tag('option', $key, $arr);
    }
    $html_options = array_merge(
        array('name' => $name, 'id' => $name),
        $html_options
    );
    return "<select".tag_options($html_options).">$opts</select>";
}

function form_tag($uri = null, $options = array())
{
    if ($uri == null) {
        $uri = $_SERVER['PHP_SELF'];
    }
    $options = array_merge(
        array('method' => 'get', 'action' => $uri),
        $options
    );
    return tag('form', $options, true);
}

function form_end_tag()
{
    return "</form>";
}
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