在文本中搜索一個單詞並突出顯示它

我正在嘗試編寫一個PHP腳本，它將文本作爲輸入，瀏覽整個文本（例如它可以是一篇很長的文章），然後搜索字形式的用戶輸入。在文本中搜索一個單詞並突出顯示它

它應該打印出用戶正在搜索的高亮顯示字詞的全文，無論它在哪裏找到。

<!DOCTYPE html> 
<html> 

<head> 
    <meta charset="UTF-8"> 
    <title>Search for a word in text</title> 
</head> 

<body> 

    <form method="post" action="index.php"> 
     <input type="text" name="text" placeholder="Insert the text you want to search in..."> 
     <input type="text" name="find_x" placeholder="Insert the word you want to find..."> 
     <input type="submit" value="Search"> 
    </form> 

    <?php 

     // this just prints out a line used to devide input area from a result 
     $line = "<br>" . str_repeat("___", 40) . "<br></br>"; 
     echo $line; 

     if (isset($_POST["text"]) and !empty($_POST["text"]) and 
      isset($_POST["find_x"]) and !empty($_POST["find_x"])) 
     { 
      $text = $_POST["text"]; 
      $find_x = $_POST["find_x"]; 

      // transforms inputs to lowercase so the word is found even if written in uppercase 
      $text_lc = strtolower($text); 
      $find_x_lc = strtolower($find_x); 

      // find length of searched word 
      $length_of_x = strlen($find_x_lc); 

      // variable for offsetting 
      $offset = 0; 

      // prints out all starting positions of a searched word 
      while ($position_in_text = strpos($text_lc, $find_x_lc, $offset)) 
      { 
       echo "The string <b><u>$find_x</u></b> is found in your text and it is at position $position_in_text" . "<br>"; 
       $offset = $position_in_text + $length_of_x; 
      } 


      // here I want to print the whole text, and wherever the searched word appears in the text it should be highlighted (bold or underlined). I don't know how to do that!? 

     } 

    ?> 

</body>

來源

2016-12-31 Nedzad Ganic

你錯過了，我說的註釋：「波紋管只是一些應該解釋什麼，我試圖做的，我知道，這個代碼將不能像這樣的工作。」 –

我正在嘗試打印整個文本，並在該文本中搜索詞的每個實例都應該突出顯示。解析錯誤不是問題。（ - 1）+ 6 –

你剛剛通過代碼快速，沒有看到我實際上正在嘗試做什麼 –

而不是使用strpos你可以使用stripos函數，這樣你可以保持大小寫也是如此。另外請注意，如果搜索文本位於0位，即while(false !== stripos())甚至可能不會運行，這意味着它位於字符串的起始位置，因此需要檢查stripos/strpos是否會返回false（如果未找到匹配，則爲false）。

<!DOCTYPE html> 
<html> 

<head> 
    <meta charset="UTF-8"> 
    <title>Search for a word in text</title> 
</head> 

<body> 

    <form method="post" action="index.php"> 
     <input type="text" name="text" placeholder="Insert the text you want to search in..."> 
     <input type="text" name="find_x" placeholder="Insert the word you want to find..."> 
     <input type="submit" value="Search"> 
    </form> 

    <?php 

     // this just prints out a line used to devide input area from a result 
     $line = "<br>" . str_repeat("___", 40) . "<br></br>"; 
     echo $line; 

     if (isset($_POST["text"]) and !empty($_POST["text"]) and 
      isset($_POST["find_x"]) and !empty($_POST["find_x"])) 
     { 
      $text = $_POST["text"]; 
      $find_x = $_POST["find_x"]; 

      // transforms inputs to lowercase so the word is found even if written in uppercase 
      //~ $text_lc = strtolower($text); 
      //~ $find_x_lc = strtolower($find_x); 

      // find length of searched word 
      //~ $length_of_x = strlen($find_x_lc); 
      $length_of_x = strlen($find_x); 

      // variable for offsetting 
      $offset = 0; 

      // prints out all starting positions of a searched word 
      while (false !== ($position_in_text = stripos($text, $find_x, $offset))) 
      { 
       $found_string = substr($text, $position_in_text, $length_of_x); 

       echo "The string <b><u>", htmlspecialchars($found_string), "</u></b> is found in your text and it is at position $position_in_text" . "<br>"; 
       // maybe even sanitizing or escaping some of the texts? XSS here 
       //~ $replacement = sprintf('<strong>%s</strong>', htmlspecialchars($found_string)); 
       $replacement = sprintf('<strong>%s</strong>', $found_string); 
       $text = substr_replace($text, $replacement, $position_in_text, $length_of_x); 
       $offset = $position_in_text + strlen($replacement); 
      } 

      echo $line, $text;    
     } 

    ?> 

</body>

Text: 
hello world HELLO again and good night heLLo 

Search string: 
hello 

Expected Result should look like: 
<strong>hello</strong> world <strong>HELLO</strong> again and good night <strong>heLLo</strong>

來源

2016-12-31 02:22:45

偉大的解決方案，它完全符合我的目標。謝謝。 –

歡迎您的光臨，但請確保您清理並清除將在瀏覽器中顯示的所有字符串，因爲它表明它對XSS攻擊開放。 –

在文本中搜索一個單詞並突出顯示它

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