function get_opengraphprotocoltools_tag($property, $content)
{
if (empty($property) || empty($content)) {
return;
}
// array of property values or structured property
if (is_array($content)) {
$meta_tags = array();
foreach ($content as $structured_property => $content_value) {
// handle numeric keys from regular arrays
// account for the special structured property of url which is equivalent to the root tag and sets up the structure
if (!is_string($structured_property) || $structured_property === 'url') {
$meta_tags[] = get_opengraphprotocoltools_tag($property, $content_value);
} else {
$meta_tags[] = get_opengraphprotocoltools_tag($property . ':' . $structured_property, $content_value);
}
}
return implode("\n", $meta_tags);
} else {
if (strstr($property, 'twitter:')) {
return "<meta name=\"{$property}\" content=\"" . esc_attr($content) . "\" />";
}
return "<meta property=\"{$property}\" content=\"" . esc_attr($content) . "\" />";
}
}
function get_opengraphprotocoltools_headers($data)
{
if (!count($data)) {
return;
}
$out = array();
$out[] = "\n<!-- BEGIN: Open Graph Protocol Tools: http://opengraphprotocol.org/ for more info -->";
foreach ($data as $property => $content) {
if ($content != '') {
$out[] = get_opengraphprotocoltools_tag($property, $content);
} else {
$out[] = "<!--{$property} value was blank-->";
}
}
$out[] = "<!-- End: Open Graph Protocol Tools-->\n";
return implode("\n", $out);
}
