php截取字符串

1.substr(源字符串,其实位置[,长度])-截取字符串返回部分字符串 <?php $str ="itmop.com"; echo substr($str, 2); //mop.com echo substr($str, 2,3); //mop echo substr($str, -2); //om 负数从结尾开始取 ?> 但是当你截取中文字符串