1.pcre编译异常导致preg_split()不能匹配UTF8编码中文字符串
解决方法：
修改\tcpdf\include\tcpdf_static.php文件中的pregSplit函数
源码：
public static function pregSplit($pattern, $modifiers, $subject, $limit=NULL, $flags=NULL) {// the bug only happens on PHP 5.2 when using the u modifierif ((strpos($modifiers, 'u') === FALSE) OR (count(preg_split('//u', "\n\t", -1, PREG_SPLIT_NO_EMPTY)) == 2)) {return preg_split($pattern.$modifiers, $subject, $limit, $flags);}// preg_split is bugged - try alternative solution$ret = array();while (($nl = strpos($subject, "\n")) !== FALSE) {$ret = array_merge($ret, preg_split($pattern.$modifiers, substr($subject, 0, $nl), $limit, $flags));$ret[] = "\n";$subject = substr($subject, ($nl + 1));}if (strlen($subject) > 0) {$ret = array_merge($ret, preg_split($pattern.$modifiers, $subject, $limit, $flags));}return $ret;
}
改为：
public static function pregSplit($pattern, $modifiers, $subject, $limit=NULL, $flags=NULL) {// the bug only happens on PHP 5.2 when using the u modifierif ((strpos($modifiers, 'u') === FALSE) OR (count(preg_split('//', "\n\t", -1, PREG_SPLIT_NO_EMPTY)) == 2)) {$length = mb_strlen($subject, 'utf-8');$titlearray = [];for ($i=0; $i<$length; $i++){$titlearray[] = mb_substr($subject, $i, 1, 'utf-8');}return $titlearray;}// preg_split is bugged - try alternative solution$ret = array();while (($nl = strpos($subject, "\n")) !== FALSE) {$length = mb_strlen($subject, 'utf-8');$titlearray = [];for ($i=0; $i<$length; $i++){$titlearray[] = mb_substr($subject, $i, 1, 'utf-8');}$ret = array_merge($ret, $titlearray);$ret[] = "\n";$subject = substr($subject, ($nl + 1));}if (strlen($subject) > 0) {$length = mb_strlen($subject, 'utf-8');$titlearray = [];for ($i=0; $i<$length; $i++){$titlearray[] = mb_substr($subject, $i, 1, 'utf-8');}$ret = array_merge($ret, $titlearray);}return $ret;
}