Meta Box Bank Soal + Plugin Matematika

// Add the Meta Box --->> Create a Meta Box
function add_custom_meta_box() {
    add_meta_box(
        'custom_meta_box', // $id
        'Custom Meta Box', // $title
        'show_custom_meta_box', // $callback
        'post', // $page
        'normal', // $context
        'high'); // $priority
}
add_action('add_meta_boxes', 'add_custom_meta_box');

// Field Array -->> Create the Field Array
$prefix = 'banksoal_';
$custom_meta_fields = array(
    array(
        'label'=> 'Download',
        'desc'  => 'A description for the field.',
        'id'    => $prefix.'download',
        'type'  => 'text'
    ),
    array(
        'label'=> 'Kunci',
        'desc'  => 'A description for the field.',
        'id'    => $prefix.'kunci',
        'type'  => 'textarea'
    ),

);

// The Callback -->> Outputting the Fields
function show_custom_meta_box() {
global $custom_meta_fields, $post;
// Use nonce for verification
echo '<input type="hidden" name="custom_meta_box_nonce" value="'.wp_create_nonce(basename(__FILE__)).'" />';

    // Begin the field table and loop
    echo '<table class="form-table">';
    foreach ($custom_meta_fields as $field) {
        // get value of this field if it exists for this post
        $meta = get_post_meta($post->ID, $field['id'], true);
        // begin a table row with
        echo '<tr>
                <th><label for="'.$field['id'].'">'.$field['label'].'</label></th>
                <td>';
                switch($field['type']) {




// TEXT
case 'text':
    echo '<input type="text" name="'.$field['id'].'" id="'.$field['id'].'" value="'.$meta.'" size="30" />
        <br /><span class="description">'.$field['desc'].'</span>';
break;

// TEXT AREA
case 'textarea':
    echo '<textarea name="'.$field['id'].'" id="'.$field['id'].'" cols="60" rows="4">'.$meta.'</textarea>
        <br /><span class="description">'.$field['desc'].'</span>';
break;


                } //end switch
        echo '</td></tr>';
    } // end foreach
    echo '</table>'; // end table
}



// SAVE THE DATA
function save_custom_meta($post_id) {
    global $custom_meta_fields;

    // verify nonce
    if (!wp_verify_nonce($_POST['custom_meta_box_nonce'], basename(__FILE__)))
        return $post_id;
    // check autosave
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
        return $post_id;
    // check permissions
    if ('page' == $_POST['post_type']) {
        if (!current_user_can('edit_page', $post_id))
            return $post_id;
        } elseif (!current_user_can('edit_post', $post_id)) {
            return $post_id;
    }
    // loop through fields and save the data
    foreach ($custom_meta_fields as $field) {
        $old = get_post_meta($post_id, $field['id'], true);
        $new = $_POST[$field['id']];
        if ($new && $new != $old) {
            update_post_meta($post_id, $field['id'], $new);
        } elseif ('' == $new && $old) {
            delete_post_meta($post_id, $field['id'], $old);
        }
    } // end foreach
}
add_action('save_post', 'save_custom_meta');


====================================
MENAMPILKANNYA
====================================

<div style="text-align: center !important;">



   <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- responsiv-bawah -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-1162866178338695"
     data-ad-slot="6086448713"
     data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>




<div id="spoiler" style="display:none">

<?php
    $my_download = get_post_meta( get_the_ID(), 'banksoal_download', true);
        if( ! empty( $my_download ) ) {
        echo '<a href="' . $my_download . '" target="_blank"><b>DOWNLOAD FILE BANK SOAL INI</b></a>';
    }
?>




<?php
    $my_kunci = get_post_meta( get_the_ID(), 'banksoal_kunci', true);
        if( ! empty( $my_kunci ) ) {
        echo '' . $my_kunci . '';
    }
?>


</div>
<button title="Click to Show/Hide Content" type="button" onclick="if(document.getElementById('spoiler') .style.display=='none') {document.getElementById('spoiler') .style.display=''}else{document.getElementById('spoiler') .style.display='none'}">Show/Hide Kunci Jawaban</button>

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- responsiv-bawah -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-1162866178338695"
     data-ad-slot="6086448713"
     data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>


</div>



==================================
PLUGIN MATEMATIKA
=======================================

WPMathPub: http://wordpress.org/plugins/wpmathpub/
Name: wpmathpub
Panduan: http://www.xm1math.net/phpmathpublisher/doc/help.html (sdh mati)
File demo download: https://github.com/daanforever/phpmathpublisher


Contoh-contoh penulisan:

[pmath size=14]int{0}{2} {(x^2 } + sin x)dx = 4.08[/pmath]

[pmath size=14]delim{[}{matrix{3}{3}{5 3 0 6 7 0 1 2 8}}{]} [/pmath]

[pmath size=14]delim{[}{matrix{3}{3}{5 3 (cos 2) 6 7 0 1 -2 (sin 5)}}{]} [/pmath]

[pmath size=14]int{0}{pi /2}{(x^2 } + sin x)dx = 2.29[/pmath]

[pmath size=14]delim{[}{matrix{3}{3}{5 3 {cos 2} 6 7 0 1 {-2} {sin 5}}}{]} [/pmath]

[pmath size=12]S(f)(t)=a_{0}+sum{n=1}{+infty}{a_{n} cos(n omega t)+b_{n} sin(n omega t)}[/pmath]

[pmath size=24]delim{lbrace}{matrix{3}{1}{{3x-5y+z=0} {sqrt{2}x-7y+8z=0} {x-8y+9z=0}}}{ }[/pmath]

[pmath]delim{|}{{1/N} sum{n=1}{N}{gamma(u_n)} - 1/{2 pi} int{0}{2 pi}{gamma(t) dt}}{|} <= epsilon/3[/pmath]