收集一些有用的php函数---from cmstop

1,格式化输出字符串到js

function js_format($string)
{ 
    return addslashes(str_replace(array("\r", "\n"), array('', ''), $string));
}

2,text_format

function text_format($string)
{
    return nl2br(str_replace(' ', ' ', htmlspecialchars($string)));
}

 

3,file_ext

function fileext($filename)
{
    return pathinfo($filename, PATHINFO_EXTENSION);
}

 

4,str_cut

function str_cutword($string,$length=80,$charset="utf-8",$etc='...')
{
        $start = 0;
        if (function_exists ("mb_substr" ))
            return mb_substr ( $string, $start, $length, $charset );
        $re ['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
        $re ['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
        $re ['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
        $re ['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
        preg_match_all ( $re [$charset], $string, $match );
        $slice = join ( "", array_slice ( $match [0], $start, $length ) );
        
        return $slice.$etc;
}

 

5,str_cut

function str_cut($string, $length, $dot = '...', $charset = 'utf-8')
{
    $strlen = strlen($string);
    if($strlen <= $length) return $string;
    $specialchars = array('&amp;', '&quot;', '&#039;', '&lt;', '&gt;');
    $entities = array('&', '"', "'", '<', '>');
    $string = str_replace($specialchars, $entities, $string);
    $strcut = '';
    if(strtolower($charset) == 'utf-8')
    {
        $n = $tn = $noc = 0;
        while($n < $strlen)
        {
            $t = ord($string[$n]);
            if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
                $tn = 1; $n++; $noc++;
            } elseif(194 <= $t && $t <= 223) {
                $tn = 2; $n += 2; $noc += 2;
            } elseif(224 <= $t && $t < 239) {
                $tn = 3; $n += 3; $noc += 2;
            } elseif(240 <= $t && $t <= 247) {
                $tn = 4; $n += 4; $noc += 2;
            } elseif(248 <= $t && $t <= 251) {
                $tn = 5; $n += 5; $noc += 2;
            } elseif($t == 252 || $t == 253) {
                $tn = 6; $n += 6; $noc += 2;
            } else {
                $n++;
            }
            if($noc >= $length) break;
        }
        if($noc > $length) $n -= $tn;
        $strcut = substr($string, 0, $n);
    }
    else
    {
        $dotlen = strlen($dot);
        $maxi = $length - $dotlen - 1;
        for($i = 0; $i < $maxi; $i++)
        {
            $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
        }
    }
    return $strcut.$dot;
}