array2xml.php

<?php
function generate_xml_element( $dom, $data ) {
    if ( empty( $data['name'] ) )
        return false;

    // Create the element
    $element_value = ( ! empty( $data['value'] ) ) ? $data['value'] : null;
    $element = $dom->createElement( $data['name'], $element_value );

    // Add any attributes
    if ( ! empty( $data['attributes'] ) && is_array( $data['attributes'] ) ) {
        foreach ( $data['attributes'] as $attribute_key => $attribute_value ) {
            $element->setAttribute( $attribute_key, $attribute_value );
        }
    }

    // Any other items in the data array should be child elements
    foreach ( $data as $data_key => $child_data ) {
        if ( ! is_numeric( $data_key ) )
            continue;

        $child = generate_xml_element( $dom, $child_data );
        if ( $child )
            $element->appendChild( $child );
    }

    return $element;
}

function generate_author( $author, $primary_contact ){
    if($primary_contact == 0){
        $primary_contact_boolean = true;
    }
    else {
        $primary_contact_boolean = false;
    }
    return array(
        'name' => 'author',
        'attributes' => array(
            'primary_contact' => $primary_contact_boolean,
        ),
        array(
            'name' => 'firstname',
            'value' => $author['firstname'],
        ),
        array(
            'name' => 'lastname',
            'value' => $author['lastname'],
        ),
        array(
            'name' => 'affiliation',
            'value' => $author['affiliation'],
        ),
        array(
            'name' => 'country',
            'value' => $author['country'],
        ),
        array(
            'name' => 'email',
            'value' => $author['email'],
        ),
    )
}

function generate_article( $article ){
    return array(
        'name' => 'article',
        array(
            'name' => 'title',
            'attributes' => array(
                'locale' => 'en_US',
            ),
            'value' => $article['title'],
        ),
        array(
            'name' => 'abstract',
            'attributes' => array(
                'locale' => 'en_US',
            ),
            'value' => $article['abstract'],
        ),
        for($i = 0; $i < count($article['author']); $i++){
            generate_article($article['author'][$i], $i),
        }
        array(
            'name' => 'pages',
            'value' => $article['page'],
        ),
        array(
            'name' => 'date_published',
            'value' => $article['date_published'],
        ),
        array(
            'name' => 'galley',
            'attributes' => array(
                'locale' => 'en_US',
            ),
            array(
                'name' => 'label',
                'value' => $article['label'],
            ),
            array(
                'name' => 'file',
                array(
                    'name' => 'href',
                    'attributes' => array(
                        'mime_type' => $article['mime_type'],
                        'src' => $article['src'],
                    ),
                ),
            ),
        ),  
}

function generate_section( $section ){
    return array(
        'name' => 'section',
        array(
            'name' => 'title',
            'attributes' => array(
                'locale' => 'en_US'
            ),
            'value' => $section['title']
        ),
        array(
            'name' => 'abbrev',
            'attributes' => array(
                'locale' => 'en_US'
            ),
            'value' =>  $section['abbrev']
        ),
        for( $i = 0; $i < count($section['article']); $i++ ){
            generate_article( $section['article'][$i] );
        }
    ),
}


$data = array(
    'name' => 'issue', // "name" required, all else optional
    'attributes' => array(
        'published' => 'true',
        'current' => 'true',
        'public_id' => 'XX-XXXXX',
    ),
    array(
        'name' => 'title',
        'attributes' => array(
            'locale' => 'en_US',
        ),
        'value'=> 'TITLE',
    ),
    array(
        'name' => 'volume',
        'value'=> 'INT VALUE',
    ),
    array(
        'name' => 'number',
        'value'=> 'INT NUMBER',
    ),
    array(
        'name' => 'year',
        'value'=> 'INT YEAR',
    ),
    array(
        'name' => 'cover',
        'attributes' => array(
            'locale' => 'en_US',
        ),
        array(
            'name' => 'caption',
            'value' => 'CAPTION VALUE'
        )
    ),
    array(
        'name' => 'date_published',
        'value'=> '2010-04-01',
    ),
    array(
        'name' => 'access_date',
        'value'=> '2010-03-01',
    ),
    array(
        'name' => 'section',
        array(
            'name' => 'title',
            'attributes' => array(
                'locale' => 'en_US'
            ),
            'value' => 'VALUE'
        ),
        array(
            'name' => 'abbrev',
            'attributes' => array(
                'locale' => 'en_US'
            ),
            'value' => 'VALUE'
        ),
        array(
            'name' => 'article',
            array(
                'name' => 'title',
                'attributes' => array(
                    'locale' => 'en_US',
                ),
                'value' => 'ARTICLE VALUE'
            ),
            array(
                'name' => 'abstract',
                'attributes' => array(
                    'locale' => 'en_US',
                ),
                'value' => 'ABSTRACT VALUE',
            ),
            array(
                'name' => 'author',
                'attributes' => array(
                    'primary_contact' => true,
                ),
                array(
                    'name' => 'firstname',
                    'value' => 'FIRST NAME'
                ),
                array(
                    'name' => 'lastname',
                    'value' => 'LAST NAME'
                ),
                array(
                    'name' => 'affiliation',
                    'value' => 'Affiliation value'
                ),
                array(
                    'name' => 'country',
                    'value' => 'TH'
                ),
                array(
                    'name' => 'email',
                    'value' => 'Email'
                ),
            ),
            array(
                'name' => 'pages',
                'value' => '155-200'
            ),
            array(
                'name' => 'date_published',
                'value' => '2010-04-01'
            ),
            array(
                'name' => 'galley',
                'attributes' => array(
                    'locale' => 'en_US',
                ),
                array(
                    'name' => 'label',
                    'value' => 'LABEL VAL'
                ),
                array(
                    'name' => 'file',
                    array(
                        'name' => 'href',
                        'attributes' => array(
                            'mime_type' => 'application/pdf',
                            'src' => 'http://XXXXXX',
                        )
                    )
                ),
            ),
        )
    ),
);
print_r($data);

$doc = new DOMDocument();
$child = generate_xml_element( $doc, $data );
if ( $child )
    $doc->appendChild( $child );
$doc->formatOutput = true; // Add whitespace to make easier to read XML
$xml = $doc->saveXML();

print $xml;
?>