自动生成文章摘要的php代码

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发布： 2016-07-25 09:04:04

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// php 4.3 or above needed
define("brief_length", 800); //word amount of the briefing of an article
function generate_brief($text){
global $briefing_length;
if(strlen($text) $foremost = substr($text, 0, brief_length);
$re = "/]*(>?)/i";
$single = "/base|meta|link|hr|br|param|img|area|input/i";
$stack = array(); $posstack = array();
preg_match_all($re,$foremost,$matches, preg_set_order | preg_offset_capture);
/* [child-matching specification]:
$matches[$i][1] : a "/" charactor indicating whether current "<...>" friction is closing part
$matches[$i][2] : element name.
$matches[$i][3] : right > of a "<...>" friction */
for($i = 0 ; $i if($matches[$i][1][0] == ""){
$elem = $matches[$i][2][0];
if(preg_match($single,$elem) && $matches[$i][3][0] !=""){
continue;
}
array_push($stack, strtoupper($matches[$i][2][0]));
array_push($posstack, $matches[$i][2][1]);
if($matches[$i][3][0] =="") break;
}else{
$stacktop = $stack[count($stack)-1];
$end = strtoupper($matches[$i][2][0]);
if(strcasecmp($stacktop,$end)==0){
array_pop($stack);
array_pop($posstack);
if($matches[$i][3][0] ==""){
$foremost = $foremost.">";
}
}
}
}
$cutpos = array_shift($posstack) - 1;
$foremost = substr($foremost,0,$cutpos);
return $foremost;
};
若遇到函数对多字节字符集支持得不好的情况，大家可以参考下下面这个代码。
代码2：

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function Generate_Brief($text){
global $Briefing_Length;
mb_regex_encoding("UTF-8");
if(mb_strlen($text) $Foremost = mb_substr($text, 0, BRIEF_LENGTH);
$re = "]*(>?)";
$Single = "/BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|BR/i";
$Stack = array(); $posStack = array();
mb_ereg_search_init($Foremost, $re, 'i');
while($pos = mb_ereg_search_pos()){
$match = mb_ereg_search_getregs();
/* [Child-matching Formulation]:
$matche[1] : A "/" charactor indicating whether current "<...>" Friction is Closing Part
$matche[2] : Element Name.
$matche[3] : Right > of a "<...>" Friction
*/
if($match[1]==""){
$Elem = $match[2];
if(mb_eregi($Single, $Elem) && $match[3] !=""){
continue;
}
array_push($Stack, mb_strtoupper($Elem));
array_push($posStack, $pos[0]);
}else{
$StackTop = $Stack[count($Stack)-1];
$End = mb_strtoupper($match[2]);
if(strcasecmp($StackTop,$End)==0){
array_pop($Stack);
array_pop($posStack);
if($match[3] ==""){
$Foremost = $Foremost.">";
}
}
}
}
$cutpos = array_shift($posStack) - 1;
$Foremost = mb_substr($Foremost,0,$cutpos,"UTF-8");
return $Foremost;
};
?>