php怎么实现相关文章推荐功能

int similar_text ( string $first, string $second[, float $percent] )

<?php
$demo_title= "简明现代魔法";
$demo_arr_title= array("简单易懂的现代魔法","简单明了的现代魔法","简明扼要的古代魔法","不简单的现代魔法","很难懂的现代魔法");
$new_array= getSimilar($demo_title,$demo_arr_title);
//print_r($new_array);
echo"与[$demo_title]最相关的前三个文章是：<br/>";
for($j=0; $j<=2; $j++)
{
echo($j+1).":".$new_array[$j]."<br/>";
}
//$title当前标题，$arrayTitle为需要查找的数组
functiongetSimilar($title,$arr_title)
{
$arr_len= count($arr_title);
for($i=0; $i<=($arr_len-1); $i++)
{
//取得两个字符串相似的字节数
$arr_similar[$i] = similar_text($arr_title[$i],$title);
}
arsort($arr_similar); //按照相似的字节数由高到低排序
reset($arr_similar); //将指针移到数组的第一单元
$index= 0;
foreach($arr_similaras$old_index=>$similar)
{
$new_title_array[$index] = $arr_title[$old_index];
$index++;
}
return$new_title_array;
}
?>

The speed issues for similar_text seem to be only an issue for long sections of text (>20000 chars).
I found a huge performance improvement in my application by just testing if the string to be tested was less than 20000 chars before calling similar_text.
20000+ took 3-5 secs to process, anything else (10000 and below) took a fraction of a second. Fortunately for me, there was only a handful of instances with >20000 chars which I couldn't get a comparison % for.