preg_replace和？ （問號） - 該怎麼辦？

Question

我已經做了這一行代碼，使單詞，搜索，增強。

$tekst = preg_replace("/($searchstr)/i", '<span style="color: 8fb842; font-weight: bold;">$1</span>', $tekst); 

但我的問題是，當我提出$字符串searchstr = '？';它在$ tekst字符串中的每個字母之間進行設置。

整個腳本是：

///////////////////////////////// 
// Set variables and arrays 
///////////////////////////////// 
$arr_sim = array(); 

if(!empty($_GET['search'])) 
{ 
    $text=strtolower($_GET['search']); 
    $code_entities_replace = array(' ','--','&quot;','!','@','#','$','%','^','&','*','(',')','_','+','{','}','|',':','"','<','>','?','[',']','\\',';',"'",',','.','/','~','`','=', 'Æ', 'æ', '&aelig;', 'ø', 'Ø', '&oslash;', 'å', '&aring;', 'Å'); 
    $code_entities_match = array('-','--','','_quot_','_s_','_s-a_','_sq_','procent','_tria_','_and_','_star_','_par-st_','_par-end_','_us_','_plus_','_tub-st_','_tub-end_','_line_','_col_','_anf_','_lt_','_st_','_qm_','_sqpar-s_','_sqpar-e_','_backsla2_', '_semcol_','_1anf_','_comma_','_punc_','_slash_','_nearequ_', '_msql-anf_', '_equal_', 'ae', 'ae', 'ae', 'oe', 'oe', 'oe', 'aa', 'aa', 'aa'); 
    $text = str_replace($code_entities_match, $code_entities_replace, $text); 
    $searchstr = $text; 
    $search_str = $showpages->escape_str($text); 

    $showpages->_table = 'pages'; 
    $showpages->_where = " tekst LIKE '%". $search_str . "%' AND language_id = '" . $_SESSION['lang_id']. "'"; 
    $showpages->_orderby = 'id'; 
    $showpages->_order = 'desc'; 

    $f = $showpages->search(); 

    while ($row = mysql_fetch_array($f)) 
    { 
     $arr_text = explode(" ",$row['tekst']); 
     $percent = 0; 
     $words = count($arr_text); 
     foreach($arr_text as $k => $v) 
     { 
      similar_text($search_str, $v, $p); 
      $percent += $p; 
     } 
     $percent = $percent/$words; 

     $arr_sim[] = array('percent' => $percent, 'id' => $row['id']); 
    } 
} 

///////////////////////////////// 
// Set some variables 
///////////////////////////////// 
$arr_len = count($arr_sim); 
if(!empty($_GET['offset'])) 
    $offset = $showpages->escape_str($_GET['offset']); 
else 
    $offset = 0; 

if($arr_len >= 15) 
{ 
    $limit = 15; 
} else { 
    $limit = $arr_len; 
} 
$start = $offset+$limit; 

rsort($arr_sim); // Sort the array to make the script show in the right order. 
///////////////////////////////// 


/////////////////// 
// Show content 
//////////////////// 

if($arr_len > 0) 
// check if the search is performed and any hits were found. 
{ 
    for($i = $offset; $i < $start; $i++) 
    { 
     // $arr_sim[$i]['id'] 
     $showpages->_table = 'pages'; 
     $showpages->_id  = $arr_sim[$i]['id']; 
     $showpages->_orderby = 'id'; 
     $showpages->_order = 'desc'; 
     $z = $showpages->search(); 
     $r = $showpages->fetch_array($z); 

     $tekst = strip_tags($r['tekst'], "<p><a>"); 
     $str_pos = strpos($tekst, $searchstr); 
     if($str_pos > 50){ 
      $start_str = '...'; 
      if(strlen($tekst) > 200) 
      { 
       $end_str = '...'; 
      } 
      $tekst = substr($tekst, $str_pos-50, 200); 
     } else { 
      $start_str = ''; 
      if(strlen($tekst) > 200) 
      { 
       $end_str = '...'; 
      } 
      $tekst = substr($tekst, 0, 200); 
     } 

     $tekst = preg_replace("/($searchstr)/i", '<span style="color: 8fb842; font-weight: bold;">$1</span>', $tekst); 

     $dataa .= '<style type="text/css">.search-fr { margin-bottom: 15px; } .search-fr a {padding: 0; margin: 0 0 5px 0; font-weight: bold; font-size: 14px;} .search-fr p { padding: 0; margin: 0;}</style>'; 
     $dataa .= '<div class="search-fr">'; 
     $dataa .= '<a href="' . HTTP_SITE_ROOT . DIRECTORY_SEPERATOR . $r['metashorttag'] . '" class="link2">' . $r['emne'] . '</a> - Matcher din søgning <b>'. round($arr_sim[$i]['percent']).'%</b><br />'; 
     $dataa .= $start_str.$tekst.$end_str; 
     $dataa .= '</div>'; 
    } 
} else { 
    $dataa .= 'Der er ikke fundet nogle sider, der matcher din søgning. Prøv igen.'; 
} 

Answer 1

您可以運行在$searchstr的preg_quote()功能，將難逃任何元字符的字符串作爲你的模式之前。

例如：

$tekst = preg_replace('/'.preg_quote($searchstr, '/').'/i', '<span style="color: 8fb842; font-weight: bold;">$1</span>', $tekst);