<?php
$text='';
$str_1=array(
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
"А","Б","В","Г","Д","Е","Ё","Ж","З","И","Й","К","Л","М","Н","О","П","Р","С","Т","У","Ф","Х","Ц","Ч","Ш","Щ","Ъ","Ы","Ь","Э","Ю","Я",
"(",")",'"',"'",'.',',',':',';','>','<','  ','!','?');
$str_2=array(
'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
"а","б","в","г","д","е","ё","ж","з","и","й","к","л","м","н","о","п","р","с","т","у","ф","х","ц","ч","ш","щ","ъ","ы","ь","э","ю","я",
'','','','','','','','','','',' ','','');
$text_poisk_post='';
if(isset($_POST["text"])){$text_poisk_post=htmlspecialchars(stripslashes(strip_tags(trim(str_replace($str_1,$str_2,$_POST["text"])))));}
//--- загрузка базы
$user_book=$_SERVER['DOCUMENT_ROOT'].'/-php-/poisk/info.txt';
if(file_exists($user_book)){$poisk_if='ok';}else{$poisk_if='no';}
if(!$text_poisk_post){$poisk_if='no';}
$book_arr_count=0;// количество
if($poisk_if=='ok'){
    $text=file_get_contents($user_book); $book_arr=explode("\n", $text); $book_arr_count=count($book_arr)-1;
    $i=0;  while ($i < $book_arr_count) { $book_m[$i]=explode("] _ [", $book_arr[$i]);
    $poisk_bd[$i][0]=0;// процент сходства
    $poisk_bd[$i][1]=$book_m[$i][0];// URL где находится книга
    $poisk_bd[$i][2]=str_replace($str_1,$str_2,$book_m[$i][1]); // заголавок title
    $poisk_bd[$i][3]=str_replace($str_1,$str_2,$book_m[$i][11]);  // краткое описание description
    $i++;}
}//--- загрузка базы
if($poisk_if=='ok'){
$poisk_post_arr=explode(" ", $text_poisk_post);
$poisk_post_arr_count=count($poisk_post_arr);
$post_i=0;while ($post_i < $poisk_post_arr_count) {
  // проверяем заголавок title
   $i=0; while ($i < $book_arr_count) {
     $poisk_bd_title=explode(" ",$poisk_bd[$i][2]);
     $poisk_bd_title_count=count($poisk_bd_title);
     $ii=0;while ($ii < $poisk_bd_title_count) {
        similar_text($poisk_bd_title[$ii],$poisk_post_arr[$post_i] , $perc_1); // сравниваем
        if($perc_1>90){$poisk_bd[$i][0]=$poisk_bd[$i][0]+1;} // сравниваем совпадения 90%
     $ii++;}
  $i++;}
  // проверяем заголавок title
  // провиряем краткое описание description
   $i=0; while ($i < $book_arr_count) {
     $poisk_bd_title=explode(" ",$poisk_bd[$i][3]);
     $poisk_bd_title_count=count($poisk_bd_title);
     $ii=0;while ($ii < $poisk_bd_title_count) {
        similar_text($poisk_bd_title[$ii],$poisk_post_arr[$post_i] , $perc_1); // сравниваем
        if($perc_1>90){$poisk_bd[$i][0]=$poisk_bd[$i][0]+1;} // сравниваем совпадения 90%
     $ii++;}
  $i++;}
  // провиряем краткое описание description
 $post_i++;}
}

// ----- фильтруем  ----------------
array_multisort($poisk_bd, SORT_DESC);
// ----- фильтруем  ----------------

//========================= Вывод ==============================
echo '<p style="text-align:center;">Поиск по фразе:<b>'.$text_poisk_post.'</b></p>';
$i=0;
while ($i < $book_arr_count) {
    if($poisk_bd[$i][0]==0){$i=$book_arr_count;}else{
        ?>
        <div>
        <a href="<?php echo $poisk_bd[$i][1]; ?>" style="display:block; font-weight:bold;"><?php echo $poisk_bd[$i][2]; ?></a>
        <?php echo $poisk_bd[$i][3]; /*краткое описание description*/ ?>
        </div>
        <?php
    }$i++;}
//========================= Вывод ==============================
?>