例如,它只返回搜索关键字所在的片段。
并且部分文本被替换为“...”。
是否可以使用 PHP 和 MySQL 实现该目标?
稍微修改了 deceze 的功能以允许多个短语。例如,您的短语可以是“testa testb”,如果它没有找到 testa,那么它将转到 testb。
function excerpt($text, $phrase, $radius = 100, $ending = "...") {
$phraseLen = strlen($phrase);
if ($radius < $phraseLen) {
$radius = $phraseLen;
}
$phrases = explode (' ',$phrase);
foreach ($phrases as $phrase) {
$pos = strpos(strtolower($text), strtolower($phrase));
if ($pos > -1) break;
}
$startPos = 0;
if ($pos > $radius) {
$startPos = $pos - $radius;
}
$textLen = strlen($text);
$endPos = $pos + $phraseLen + $radius;
if ($endPos >= $textLen) {
$endPos = $textLen;
}
$excerpt = substr($text, $startPos, $endPos - $startPos);
if ($startPos != 0) {
$excerpt = substr_replace($excerpt, $ending, 0, $phraseLen);
}
if ($endPos != $textLen) {
$excerpt = substr_replace($excerpt, $ending, -$phraseLen);
}
return $excerpt;
}
高亮功能
function highlight($c,$q){
$q=explode(' ',str_replace(array('','\\','+','*','?','[','^',']','$','(',')','{','}','=','!','<','>','|',':','#','-','_'),'',$q));
for($i=0;$i<sizeOf($q);$i++)
$c=preg_replace("/($q[$i])(?![^<]*>)/i","<span class=\"highlight\">\${1}</span>",$c);
return $c;}
我对多个关键字和多次出现的解决方案(也适用于不区分重音的大小写):
function excerpt($text, $query)
{
//words
$words = join('|', explode(' ', preg_quote($query)));
//lookahead/behind assertions ensures cut between words
$s = '\s\x00-/:-@\[-`{-~'; //character set for start/end of words
preg_match_all('#(?<=['.$s.']).{1,30}(('.$words.').{1,30})+(?=['.$s.'])#uis', $text, $matches, PREG_SET_ORDER);
//delimiter between occurences
$results = array();
foreach($matches as $line) {
$results[] = htmlspecialchars($line[0], 0, 'UTF-8');
}
$result = join(' <b>(...)</b> ', $results);
//highlight
$result = preg_replace('#'.$words.'#iu', "<span class=\"highlight\">\$0</span>", $result);
return $result;
}
这是 query = "švihov prohlídkám" 的示例结果
function excerpt($text, $phrase, $radius = 100, $ending = "...") {
$phraseLen = strlen($phrase);
if ($radius < $phraseLen) {
$radius = $phraseLen;
}
$pos = strpos(strtolower($text), strtolower($phrase));
$startPos = 0;
if ($pos > $radius) {
$startPos = $pos - $radius;
}
$textLen = strlen($text);
$endPos = $pos + $phraseLen + $radius;
if ($endPos >= $textLen) {
$endPos = $textLen;
}
$excerpt = substr($text, $startPos, $endPos - $startPos);
if ($startPos != 0) {
$excerpt = substr_replace($excerpt, $ending, 0, $phraseLen);
}
if ($endPos != $textLen) {
$excerpt = substr_replace($excerpt, $ending, -$phraseLen);
}
return $excerpt;
}
无耻地从Cake TextHelper 窃取。
$snippet = "//mysql query";
function trimmer($updates,$wrds){
if(strlen($updates)<=$wrds){
return $updates;
}else{
$marker = strrpos(substr($updates,0,$wrds),' ');
$string = substr(substr($updates,0,$wrds),0,$marker)."...";return $string;
}
echo trimmer($snippet,200); //You can send the snippet string to this function it searches for the last space if string length is greater than 200 and adds "..." to it
这可能是你想要的(编辑):
$string1="Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.";
function trimmer($updates,$wrds,$pos){
if(strlen($updates)<=$wrds) {
return $updates;
} else {
$marker = strrpos(substr($updates,$pos,$wrds),' ');
$string = substr(substr($updates,$pos,$wrds),0,$marker)."...";
return $string;
}
}
$pos = strpos($string1, "dummy");
echo trimmer($string1,100,$pos);