PHP summary generation function (no garbled code)_PHP tutorial-PHP Tutorial-php.cn

PHP summary generation function (no garbled code)_PHP tutorial

WBOY

Release： 2016-07-21 15:20:37

Original

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When using it, you must first strip_tags() the content to be generated. Of course, you can also add strip_tags() directly to the function. I didn't do it. Just add it yourself. The following is the function:

Copy code The code is as follows:

 
function cutstr($string, $length,$charset,$dot ) {//Character, interception length, character set, end character 
if(strlen($string) <= $length) { 
return $string; 
} 
$pre = chr( 1); 
$end = chr(1); 
//Protect special string
$string = str_replace(array('&', '"', '<', '>' ), array($pre.'&'.$end, $pre.'"'.$end, $pre.'<'.$end, $pre.'>'.$end), $string) ; 
$strcut = ''; 
if(strtolower($charset) == 'utf-8') { 
$n = $tn = $noc = 0; 
while($n < strlen($string)) { 
$t = ord($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, $n); 
} else { 
for($i = 0; $i < $length; $i++) { 
$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i]; 
} 
} 
//Restore Special string
$strcut = str_replace(array($pre.'&'.$end, $pre.'"'.$end, $pre.'<'.$end, $pre.'> '.$end), array('&', '"', '<', '>'), $strcut); 
//Fix the problem of special string truncation
$pos = strrpos($s, chr(1)); 
if($pos !== false) { 
$strcut = substr($s,0,$pos); 
} 
return $strcut.$dot; 
} 