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<?php |
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namespace Wa72\HtmlPageDom; |
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/** |
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* Static helper functions for HtmlPageDom |
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* |
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* @package Wa72\HtmlPageDom |
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*/ |
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class Helpers |
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{ |
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/** |
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* remove newlines from string and minimize whitespace (multiple whitespace characters replaced by one space) |
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* useful for cleaning up text retrieved by HtmlPageCrawler::text() (nodeValue of a DOMNode) |
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* |
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* @param string $string |
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* @return string |
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*/ |
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public static function trimNewlines($string) |
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{ |
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$string = str_replace("\n", ' ', $string); |
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$string = str_replace("\r", ' ', $string); |
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$string = preg_replace('/\s+/', ' ', $string); |
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return trim($string); |
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} |
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/** |
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* Convert CSS string to array |
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* |
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* @param string $css list of CSS properties separated by ; |
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* @return array name=>value pairs of CSS properties |
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*/ |
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public static function cssStringToArray($css) |
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{ |
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$statements = explode(';', preg_replace('/\s+/s', ' ', $css)); |
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$styles = []; |
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foreach ($statements as $statement) { |
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$statement = trim($statement); |
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if ('' === $statement) { |
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continue; |
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} |
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$p = strpos($statement, ':'); |
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if ($p <= 0) { |
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continue; |
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} // invalid statement, just ignore it |
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$key = trim(substr($statement, 0, $p)); |
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$value = trim(substr($statement, $p + 1)); |
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$styles[$key] = $value; |
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} |
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return $styles; |
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} |
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/** |
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* Convert CSS name->value array to string |
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* |
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* @param array $array name=>value pairs of CSS properties |
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* @return string list of CSS properties separated by ; |
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*/ |
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public static function cssArrayToString($array) |
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{ |
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$styles = ''; |
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foreach ($array as $key => $value) { |
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$styles .= $key . ': ' . $value . ';'; |
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} |
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return $styles; |
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} |
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/** |
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* Helper function for getting a body element |
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* from an HTML fragment |
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* |
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* @param string $html A fragment of HTML code |
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* @param string $charset |
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* @return \DOMNode The body node containing child nodes created from the HTML fragment |
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*/ |
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public static function getBodyNodeFromHtmlFragment($html, $charset = 'UTF-8') |
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{ |
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$html = '<html><body>' . $html . '</body></html>'; |
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$current = libxml_use_internal_errors(true); |
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if (\PHP_VERSION_ID < 80000) { |
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$disableEntities = libxml_disable_entity_loader(true); |
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} |
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$d = new \DOMDocument('1.0', $charset); |
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$d->validateOnParse = true; |
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if (function_exists('mb_convert_encoding') && in_array( |
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strtolower($charset), |
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array_map('strtolower', mb_list_encodings()) |
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) |
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) { |
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$html = mb_convert_encoding($html, 'HTML-ENTITIES', $charset); |
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} |
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@$d->loadHTML($html); |
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libxml_use_internal_errors($current); |
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if (\PHP_VERSION_ID < 80000) { |
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libxml_disable_entity_loader($disableEntities); |
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} |
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return $d->getElementsByTagName('body')->item(0); |
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} |
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} |
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godbout /
htmlpagedom
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