PHP截取中文字符串函数总结

/**
* Get the content between $start and $end
*
* @param string $content 原始字符
* @param string $start     起始字符
* @param string $end      结束字符
* @return string
*/
function GetStringBetween($content,$start,$end){
    $r = explode($start, $content);
    if (isset($r[1])){
        $r = explode($end, $r[1]);
        return $r[0];
    }
    return '';
}

/**
* Get the content between $start and $end
*
* @param string $content 原始字符
* @param string $start     起始字符
* @param string $end      结束字符
* @return string
*/
function get_string_between($string, $start, $end){
    $string = " ".$string;
    $ini = strpos($string,$start);
    if ($ini == 0) return "";
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) - $ini;
    return substr($string,$ini,$len);
}

/**
* Get all every strings between two tags
*
* @param string $string 原始字符串
* @param string $start  起始字符串
* @param string $end   结束字符串
* @return array
*/
function get_all_strings_between($string,$start,$end)
{
    //Returns an array of all values which are between two tags in a set of data
    $strings = array();
    $startPos = 0;
    $i = 0;
    //echo strlen($string)."n";
    while($startPos < strlen($string) && $matched = get_string_between(substr($string,$startPos),$start,$end))
    {
        if ($matched == null || $matched[1] == null || $matched[1] == '') break;
        $startPos = $matched[0]+$startPos+1;
        array_push($strings,$matched[1]);
        $i++;
    }
    return $strings;
}

function get_string_between($string, $start, $end){
    $ini = strpos($string,$start);
    if ($ini == 0) return null;
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) - $ini;
    return array($ini+$len,substr($string,$ini,$len));
}

/**
* Get all every strings between two tags
*
* @param string $string 原始字符串
* @param string $start  起始字符串
* @param string $end   结束字符串
* @return array
*/
function get_all_strings_between($string,$start,$end)
{
    //Returns an array of all values which are between two tags in a set of data
    $strings = array();
    $startPos = 0;
    $i = 0;
    //echo strlen($string)."n";
    while($startPos < strlen($string) && $matched = get_string_between(substr($string,$startPos),$start,$end))
    {
        if ($matched == null || $matched[1] == null || $matched[1] == '') break;
        $startPos = $matched[0]+$startPos+1;
        array_push($strings,$matched[1]);
        $i++;
    }
    return $strings;
}

function get_string_between($string, $start, $end){
    $ini = strpos($string,$start);
    if ($ini == 0) return null;
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) - $ini;
    return array($ini+$len,substr($string,$ini,$len));
}

< ?php
//截取中文字符串
function mysubstr($str, $start, $len) {
$tmpstr = "";
$strlen = $start + $len;
for($i = 0; $i < $strlen; $i++) {
if(ord(substr($str, $i, 1)) > 0xa0) {
$tmpstr .= substr($str, $i, 2);
$i++;
} else
$tmpstr .= substr($str, $i, 1);
}
return $tmpstr;
}
?>

< ?php
//截取utf8字符串
function utf8Substr($str, $from, $len)
{
return preg_replace('#^(?:[＼x00-＼x7F]|[＼xC0-＼xFF][＼x80-＼xBF]+){0,'.$from.'}'.
'((?:[＼x00-＼x7F]|[＼xC0-＼xFF][＼x80-＼xBF]+){0,'.$len.'}).*#s',
'$1',$str);
}
?>