收集一些有用的php函数---from cmstop

1 function js_format($string)
2 { 
3     return addslashes(str_replace(array("\r", "\n"), array('', ''), $string));
4 }

1 function text_format($string)
2 {
3     return nl2br(str_replace(' ', ' ', htmlspecialchars($string)));
4 }

1 function fileext($filename)
2 {
3     return pathinfo($filename, PATHINFO_EXTENSION);
4 }

 1 function str_cutword($string,$length=80,$charset="utf-8",$etc='...')
 2 {
 3         $start = 0;
 4         if (function_exists ("mb_substr" ))
 5             return mb_substr ( $string, $start, $length, $charset );
 6         $re ['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
 7         $re ['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
 8         $re ['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
 9         $re ['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
10         preg_match_all ( $re [$charset], $string, $match );
11         $slice = join ( "", array_slice ( $match [0], $start, $length ) );
12         
13         return $slice.$etc;
14 }

 1 function str_cut($string, $length, $dot = '...', $charset = 'utf-8')
 2 {
 3     $strlen = strlen($string);
 4     if($strlen <= $length) return $string;
 5     $specialchars = array('&amp;', '&quot;', '&#039;', '&lt;', '&gt;');
 6     $entities = array('&', '"', "'", '<', '>');
 7     $string = str_replace($specialchars, $entities, $string);
 8     $strcut = '';
 9     if(strtolower($charset) == 'utf-8')
10     {
11         $n = $tn = $noc = 0;
12         while($n < $strlen)
13         {
14             $t = ord($string[$n]);
15             if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
16                 $tn = 1; $n++; $noc++;
17             } elseif(194 <= $t && $t <= 223) {
18                 $tn = 2; $n += 2; $noc += 2;
19             } elseif(224 <= $t && $t < 239) {
20                 $tn = 3; $n += 3; $noc += 2;
21             } elseif(240 <= $t && $t <= 247) {
22                 $tn = 4; $n += 4; $noc += 2;
23             } elseif(248 <= $t && $t <= 251) {
24                 $tn = 5; $n += 5; $noc += 2;
25             } elseif($t == 252 || $t == 253) {
26                 $tn = 6; $n += 6; $noc += 2;
27             } else {
28                 $n++;
29             }
30             if($noc >= $length) break;
31         }
32         if($noc > $length) $n -= $tn;
33         $strcut = substr($string, 0, $n);
34     }
35     else
36     {
37         $dotlen = strlen($dot);
38         $maxi = $length - $dotlen - 1;
39         for($i = 0; $i < $maxi; $i++)
40         {
41             $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
42         }
43     }
44     return $strcut.$dot;
45 }