PHP Functions

<!-- Models/Front.php -->
							
<?php
namespace Models;

class Front {
	
	public $db;
	
	public function phonize($value){
		return preg_replace('/[^0-9+]/', '', $value);
	}
	
	public function isMobile() {
        return preg_match("/(android|avantgo|blackberry|bolt|boost|cricket|docomo|fone|hiptop|mini|mobi|palm|phone|pie|tablet|up\.browser|up\.link|webos|wos)/i", $_SERVER["HTTP_USER_AGENT"]);
	}
	
	public function viberize($value){
		if(self::isMobile()){
			$viberPre = 'viber://add?number=';
			$value = str_replace(array(' ','-','+','.','/'), '',$value);
		}else{
			$viberPre = 'viber://chat?number=';
			$value = str_replace(array(' ','-','.','/'), '',$value);
		}
		return $viberPre.$value;
	}
	
	public function svg($svgName, $svgClassName = ''){
		return '<svg class="icon '.$svgClassName.'">
                <use xlink:href="/img/svgdefs.svg#'.$svgName.'" xmlns:xlink="http://www.w3.org/1999/xlink"></use>
			</svg>';
	}
	
	public function ShowImage($thumbnail, $alt = SITE_NAME, $extra_class = ''){
		$result = '';
		$imgphp = '';
		$altimg = !empty($alt) ? $alt : SITE_NAME;
		$currentPath = $thumbnail;
		if(substr_count($thumbnail, 'image=') > 0){
			$currentPath = explode('image=', $thumbnail);
			$imgphp = $currentPath[0].'image=';
			$currentPath = count($currentPath) > 1 ? $currentPath[1] : '';
		}
		if(empty($currentPath) || $currentPath[0] !== '/') return $result;
		
		$semideveloped_browsers = ['MSIE', 'Trident', 'Macintosh', 'iPad'];
		
		$NO_WEBP = false;
		$HTTP_USER_AGENT = $_SERVER['HTTP_USER_AGENT'];
		foreach ($semideveloped_browsers as $item) {
			if (substr_count($HTTP_USER_AGENT, $item) > 0) {
				$NO_WEBP = true;
				break;
			}
		}
		$thumbnailARRAY = explode('/', $currentPath);
		$pathOffset = count($thumbnailARRAY)-1;
		$thumbnailWEBP = explode('.', end($thumbnailARRAY));
		$fileOffset = count($thumbnailWEBP)-1;
		if($pathOffset < 1) return $result;
		if($fileOffset < 1) return $result;
		$mime = strtolower($thumbnailWEBP[$fileOffset]);
		$thumbnailWEBP[$fileOffset] = 'webp';
		$thumbnailARRAY[$pathOffset] = implode('.', $thumbnailWEBP);
		$newPath = implode('/', $thumbnailARRAY);
		$tmp = $_SERVER['DOCUMENT_ROOT'].$newPath;
		$webp = '';
		
		if($NO_WEBP === false){
			if (file_exists($tmp)) {
				$webp = ' <source srcset="  '.$newPath.'" type="image/webp">';
			}
		}
		$currentPath = $imgphp.$currentPath;
		$result = '<picture class="'.$extra_class.'">
                        '.$webp.'
                        <source srcset="'.$currentPath.'" type="image/'.$mime.'">
                        <img src="'.$currentPath.'" alt="'.$altimg.'">
                    </picture>';
		return $result;
	}
}

<!-- init.php -->
					
<?php
	include_once('Models/Front.php');
	
	$fr = new \Models\Front();
?>

<a href="tel:<?= $fr->phonize($CPhone) ?>"><?= $CPhone ?></a>

<?= $fr->svg('icon_tel', 'scale') ?>
						
<?= $fr->ShowImage('/img/image.jpg', 'some image', 'some_class'); ?>