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HeadHelper.class.php
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HeadHelper.class.php
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<?php
/**
* stores the HeadHelper class declaration
*/
/**
* Some helper for the code inside <head> tag
* @author etessore
*
*/
class HeadHelper{
/**
* @var array of name => content valuse for the meta tags.
*/
public $meta_tags = array();
/**
* @var array the links to be added
*/
public $links = array();
/**
* @var string the title
*/
public $title;
/**
* @var the charset of the page
*/
public $charset;
/**
* @var string Google Analytics tracking code
*/
public $ua;
/**
* @var array list of inline JavaScripts to insert in the <head> tag
*/
public $custom_scripts;
/**
* Initializes this object to default data
*/
public function __construct(){
$tempate_directory_uri = get_template_directory_uri();
$title = get_bloginfo('name') . wp_title(null, false);
$description = get_bloginfo('description');
$this
->set_title($title)
->set_meta_tag(array('name'=>'description', 'content'=>$description))
->set_meta_tag(array('name'=>'viewport', 'content'=>'width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no'))
->set_charset(get_bloginfo('charset'))
->set_link(
array(
'rel'=>'shortcut icon',
'href'=>"$tempate_directory_uri/images/favicon.png"
)
);
}
public function locate_favicon($names=array('favicon'), $extensions=array('ico','png'), $paths=array()){
if(count($paths)==0){
$images = '/images/';
$paths[] = array(
'path'=>get_template_directory().$images,
'url'=>get_template_directory_uri().$images
);
$paths[] = array(
'path'=>get_stylesheet_directory().$images,
'url'=>get_stylesheet_directory_uri().$images
);
}
foreach($paths as $path){
foreach($extensions as $extension){
foreach($names as $name){
$fname = $name.'.'.$extension;
$file = $path['path'].$fname;
if(file_exists($file)) return $path['url'].$fname;
}
}
}
}
/**
* Retrieves some usefull meta tags for the <head>
* @return some usefull meta tags for the <head>
*/
public function get_head(){
$meta_tags = $this->render_meta_tags();
$title = esc_html($this->title);
$desc = $this->render_meta_tag('description');
$ga_tracking = '';
$favicon = $this->locate_favicon();
/*file_exists(get_stylesheet_directory().'/images/favicon.ico')
? get_stylesheet_directory_uri()
: get_template_directory_uri();*/
if(!empty($this->ua)){
$ga_tracking = HtmlHelper::script(<<< EOF
var _gaq = _gaq || [];
_gaq.push(['_setAccount', '{$this->ua}'],
['_setDomainName', 'none'],
['_setAllowLinker', true ],
['_trackPageview'],
['_trackPageLoadTime'],
['second._setAccount', 'UA-4717938-7'],
['second._setDomainName', 'none'],
['second._trackPageview'],
['second._trackPageLoadTime']
);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
EOF
);
}
$custom_scripts = '';
if(count($this->custom_scripts)){
foreach($this->custom_scripts as $name => $script){
$custom_scripts = HtmlHelper::script($script, array('id'=>$name));
}
}
echo <<<EOF
<title>$title</title>
$desc
<meta charset="{$this->charset}">
$meta_tags
<link rel="shortcut icon" href="$favicon">
$ga_tracking
$custom_scripts
EOF;
}
/**
* Sets the Google Analytics tracking code
* @param string $ga UA-XXXXXX
*/
public function set_ua($ga){
$this->ua = $ga;
return $this;
}
/**
* Print the markup
*/
public function the_head(){
echo $this->get_head();
}
/**
* Set a meta tag
* @param array $meta the meta tag
* @return HeadHelper $this for chainability
*/
public function set_meta_tag($meta){
if(isset($meta['name'])){
$this->meta_tags[$meta['name']] = $meta;
}
return $this;
}
/**
* Adds an inline JavaScript to the current head section
* @param string $content the js code
* @param string $name the name of the script
* @return HeadHelper $this for chainability
*/
public function add_inline_script($content, $name=null){
$this->custom_scripts[$name] = $content;
return $this;
}
/**
* Set the title
* @param string $title the title
*/
public function set_title($title){
$this->title = $title;
return $this;
}
/**
* Set a link
* @param array $link the link
*/
public function set_link($link){
if(isset($link['name'])){
$this->link[$link['name']] = $link;
}
return $this;
}
/**
* Remove a link
* @param string $link the link name
*/
public function delete_link($link){
unset($this->links[$link]);
return $this;
}
/**
* Delete a meta tag
* @param string $name the meta name
*/
public function delete_meta_tag($name){
unset($this->meta_tags[$name]);
return $this;
}
/**
* Retrieve the meta tags list ready to be inserted into <head>
*/
public function render_meta_tags(){
$toret = '';
foreach($this->meta_tags as $name => $content){
if($name != 'description'){
$toret .= $this->render_meta_tag($name);
}
}
return $toret;
}
/**
* Render a single meta tag of the current set stored in $this->meta_tags
* @param string $name the name of the meta
*/
private function render_meta_tag($name){
if(!isset($this->meta_tags[$name])) return '';
return
'<meta name="'.$this->meta_tags[$name]['name']
.'" content="'.$this->meta_tags[$name]['content'].'">'."\n";
}
/**
* Set the charset for the page
* @param string $charset the charset
*/
public function set_charset($charset){
$this->charset = $charset;
return $this;
}
}