vars = [];
$this->og = [];
$this->ogproperties = [];
}
//Set Meta Value
// Mode:
// 0 = Default - set if no value currently exists
// 1 = Overwrite - replace existing value(s)
// 2 = Multi - append to the array of values
function set($property,$value,$mode=0) {
$ogallowsmulti = ['image','audio','video'];
if (strpos($property,'og:') === 0) {
$count = 0;
foreach ($this->og as $ogk => $ogdata) {
if (strpos($ogdata['property'],$property) === 0) {
if ($mode == 1) {
unset($this->og[$ogk]);
unset($this->ogproperties[$property]);
}
elseif ($mode == 0) {
return;
}
elseif ($value == $ogdata['value']) {
return;
}
else {
$count++;
}
}
}
if ($value !== null) {
//mode = 1 with value === null will delete the property entirely.
$components = explode(':',$property);
$ogp=$components[1];
if (!$count || in_array($ogp,$ogallowsmulti)) {
$this->og[]=['property'=>$property,'value'=>$value];
$this->ogproperties[$property] = $property;
}
}
} else {
$this->vars[$property] = $value;
}
}
function check_required() {
if (
in_array('og:title',$this->ogproperties)
&& in_array('og:type', $this->ogproperties)
&& (in_array('og:image',$this->ogproperties)
|| in_array('og:image:url',$this->ogproperties))
&& (array_key_exists('og:url', $this->ogproperties)
|| array_key_exists('og:url:secure_url', $this->ogproperties))
&& array_key_exists('og:description', $this->ogproperties)
) {
return true;
}
return false;
}
function get_field($field) {
if (strpos($field,'og:') === 0) {
foreach ($this->og as $ogdata) {
if (strpos($ogdata['property'],$field) === 0) {
$arr[$field][] = $ogdata['value'];
}
}
}
else {
$arr = $this->vars;
}
if (isset($arr) && is_array($arr) && array_key_exists($field,$arr) && $arr[$field]) {
return $arr[$field];
}
return false;
}
function get() {
// use 'name' for most meta fields, and 'property' for opengraph properties
$o = '';
if ($this->vars) {
foreach ($this->vars as $k => $v) {
$o .= '' . "\r\n" ;
}
}
if ($this->check_required()) {
foreach ($this->og as $ogdata) {
$o .= '' . "\r\n" ;
}
}
if ($o) {
return "\r\n" . $o;
}
return $o;
}
}