core2.php
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	<?php
	function is_mail ($string) {
	return preg_match('/^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z0-9]{2,4}$/', $string);
	}

	/*
	Unit testing ->
	1 is_mail("dereckson@gmail.com");
	1 is_mail("dereckson@trustspace.42");
	1 is_mail("dereckson@gmail.a.a.a.a.a.a.a.ax.org");
	1 is_mail("dereckson+wazza@gmail.com");
	0 is_mail("dereckson`ls`@gmail.com");
	*/

	/**
	* Gets an HTTP context
	*/
	function get_http_context () {
	return stream_context_create([
	'http' => [
	'method' => 'GET',
	'user_agent' => 'NasqueronTools/0.1'
	]
	]);
	}

	function get_innerHtml (DOMNode $element) {
	$innerHtml = "";

	foreach ($element->childNodes as $childNode) {
	$dom = new DOMDocument('1.0', 'utf-8');
	$dom->appendChild(
	$dom->importNode($childNode, true)
	);
	$innerHtml .= trim($dom->saveHTML());
	}

	return $innerHtml;
	}

	function get_array_from_html_table($html, $stripHTML = true) {
	$array = [];

	$html = str_ireplace('<th ', '<td ', $html);
	$html = str_ireplace('<th>', '<td>', $html);
	$html = str_ireplace('</th>', '</td>', $html);
	$html = str_ireplace('<th/>', '<td/>', $html); //No reason not to be as permissive as browsers.

	$dom = new DOMDocument('1.0', 'utf-8');
	$dom->loadHTML($html);
	$rows = $dom->getElementsByTagName('tr');
	foreach ($rows as $row) {
	$values = [];
	$rowCells = $row->getElementsByTagName('td');
	foreach ($rowCells as $cell) {
	$values[] = $stripHTML ? $cell->nodeValue : get_innerHtml($cell);
	}
	$array[] = $values;
	}
	return $array;
	}

	//Gets current date, ISO format.
	function today () {
	return date('Y-m-d');
	}

	/**
	* Cleans a string, trying to repair non-UTF8 characters
	*
	* @param string $text the text
	* @return string The cleaned text
	*/
	function clean_string ($text) {
	$regex = <<<'END'
	/
	(
	(?: [\x00-\x7F] # single-byte sequences 0xxxxxxx
	\| [\xC0-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
	\| [\xE0-\xEF][\x80-\xBF]{2} # triple-byte sequences 1110xxxx 10xxxxxx * 2
	\| [\xF0-\xF7][\x80-\xBF]{3} # quadruple-byte sequence 11110xxx 10xxxxxx * 3
	){1,100} # ...one or more times
	)
	\| ( [\x80-\xBF] ) # invalid byte in range 10000000 - 10111111
	\| ( [\xC0-\xFF] ) # invalid byte in range 11000000 - 11111111
	/x
	END;

	$utf8replacer = function ($captures) {
	if ($captures[1] != "") {
	// Valid byte sequence. Return unmodified.
	return $captures[1];
	}
	elseif ($captures[2] != "") {
	// Invalid byte of the form 10xxxxxx.
	// Encode as 11000010 10xxxxxx.
	return "\xC2".$captures[2];
	}
	else {
	// Invalid byte of the form 11xxxxxx.
	// Encode as 11000011 10xxxxxx.
	return "\xC3".chr(ord($captures[3])-64);
	}
	};

	return preg_replace_callback($regex, $utf8replacer, $text);
	}

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