newSvg() : $svg; ; if (!$this->loadSvg($svg)) { $this->loadSvg($this->newSvg()); } $this->defs = $this->svg->getElementsByTagName('defs')[0]; } protected function loadSvg(string $svg): bool { $this->svg = new DOMDocument(); return $this->svg->loadXML($svg, LIBXML_NOXMLDECL); } protected function newSvg(): string { $this->isNew = true; return ''; } public function isNew(): bool { return $this->isNew; } public function getSvg(): string { return $this->svg->saveXML(null, LIBXML_NOXMLDECL); } public function addSvg(string $name, string $svg): bool { $doc = new DOMDocument; if (!$doc->loadXML($svg)) return false; $svg = $doc->getElementsByTagName('svg')->item(0); if ($svg instanceof DOMElement) { $this->defs->appendChild($this->createSymbol($name, $svg)); return true; } else { return false; } } private function createSymbol(string $name, DOMElement $svg): DOMElement { $attributes = ['viewBox', 'preserveAspectRatio']; $symbol = $this->svg->createElement('symbol'); $symbol->setAttribute('id', $name); foreach ($attributes as $attr) { if ($svg->hasAttribute($attr)) { $value = $svg->getAttribute($attr); $symbol->setAttribute($attr, $value); } } foreach ($svg->childNodes as $node) { $symbol->appendChild($this->svg->importNode($node, true)); } return $symbol; } }