輸入名稱以兩種不同形式更改，從而導致名稱解決錯誤

Question

我有我無法解決的錯誤。我有兩種形式的提交按鈕：

<form name="form_1" action=<?php echo $_SERVER['PHP_SELF'] ;?>> 
    <input type="text" name="search_1" value="<?php echo $_GET['search'] ; ?>"> 
    <input type="submit" value="Search by Name"> 
    </form> 

<form name="form_2" action=<?php echo $_SERVER['PHP_SELF'] ;?>> 
    <input type="text" name="search_2" value="<?php echo $_GET['search'] ; ?>"> 
    <input type="submit" value="Search by Message"> 
    </form> 

錯誤說：search_1是未定義的。它怎麼可能是未定義的？ 順便說一句，如果我使兩個表單輸入名稱相同：search一切正常，但正常情況下，如果我把價值在一種形式，得到相同的輸入以其他形式也。 我做錯了什麼？

爲form_1 PHP代碼：

<?php 


    // Check if the form has been sent or if the page was accessed using the GET method. 
    if(filter_input(INPUT_SERVER, "REQUEST_METHOD") !== "GET") { 
    die(); 
    } 

    $search = filter_input(INPUT_GET, "search"); 

    // Check if the searh input has been correctly fill 
    if(!isset($search)) { 
    die(); 
    } 
    // Let's return here to prevent open an empty file 
    if(filesize($file) <= 0) { 
    return; 
    } 

    $openedFile = fopen($file, "r"); 

    // I was using the here document option, echo <<<END END; but it didn't work due to my text editor... 
    echo " 
    <table width=50% border=1> 
    <thead> 
     <tr> 
     <th>Name</th> 
     <th>Nick</th> 
     <th>Message</th> 
     </tr> 
    </thead> 
    <tbody> 
    "; 

    // Let's save in buffer the current line and then navigate through all of them 

    while(($buffer = fgets($openedFile, 4096)) !== false) { 


    $part = explode("|", $buffer); 
    // Here we check if the line has the searched word 
    if(strpos($part[0], $search) !== false && $search != '') { 

     echo " 
      <tr> 
      <td>" . $part[0] . "</td> 
      <td>" . $part[1] . "</td> 
      <td>" . $part[2] . "</td> 
      </tr> 
     "; 

    }//.if 
    }//.while 

    echo " 
    </tbody> 
    </table> 
    "; 
?> 

Answer 1

您從$_GET陣列式打印的價值，而不檢查，是在URL或不通過。

請注意，當您提交包含名稱search_1的第一個表單時，此時search_2不得在$_GET數組中設置，但是您不打算在輸入中打印該表單而不檢查。所以當你提交一個表單時，它會以另一種形式提供錯誤。

嘗試像這個 -

<form name="form_1" action=<?php echo $_SERVER['PHP_SELF'] ;?>> 
    <input type="text" name="search_1" value="<?php echo isset($_GET['search_1'])?$_GET['search_1']:"" ; ?>"> 
    <input type="submit" value="Search by Name"> 
</form> 

<form name="form_2" action=<?php echo $_SERVER['PHP_SELF'] ;?>> 
    <input type="text" name="search_2" value="<?php echo isset($_GET['search_2'])?$_GET['search_2']:"" ; ?>"> 
    <input type="submit" value="Search by Message"> 
</form>