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