Question

我收到以下错误：

Notice: Undefined offset: 1 in ... on line 93 
Notice: Undefined offset: 2 in ... on line 94

这些错误意味着什么以及如何解决？我无法看到问题所在，但我知道它们在点击“模块提交”按钮后出现

$ moduleactive = 1;

    $sql = "SELECT ModuleId, ModuleNo, ModuleName FROM Module WHERE ModuleActive = ? ORDER BY ModuleNo"; 


     $sqlstmt=$mysqli->prepare($sql);

     $sqlstmt->bind_param("i", $moduleactive);

     $sqlstmt->execute(); 

     $sqlstmt->bind_result($dbModuleId,$dbModuleNo,$dbModuleName);


    $moduleHTML  = "";  
      $moduleHTML .= '<select name="modules" id="modulesDrop">'.PHP_EOL;
 $moduleHTML .= '<option value="">Please Select</option>'.PHP_EOL;  

     while($sqlstmt->fetch()) { 
         $moduleHTML .= sprintf('<option value="%1$s_%2$s_%3$s">%1$s - %2$s</option>'.PHP_EOL, $dbModuleNo, $dbModuleName, $dbModuleId);
    } 

$moduleHTML .= '</select>'; 

    $pHTML = "";


    ?>


<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post" onsubmit="return validation(event);">
<table>
<tr>
<th>Module: <?php echo $moduleHTML; ?></th>
</tr>
</table>
<p><input id="moduleSubmit" type="submit" value="Submit Module" name="moduleSubmit" /></p>
<div id="moduleAlert"></div>
<div id="targetdiv"></div>
</form>

<?php

if (isset($_POST['moduleSubmit'])) {    

$outputmodule = ""; 

$moduleInfo = explode("_", $_POST['modules']);
$moduleNo = $moduleInfo[0];
$moduleName = $moduleInfo[1]; //Error line 93
$moduleId = $moduleInfo[2]; //Error line 94
$outputmodule = sprintf("<p><strong>Selected Module:</strong> %s - %s <input type='hidden' value='%s'></p>", $moduleNo, $moduleName, $moduleId);

}

?>

Answer 1

发生此错误，因为$ moduleInfo varibale中的索引没有值。因为没有进入$ _POST ['modules'] varible

替换它以避免错误

$moduleName =$moduleInfo[1]; //Error line 93
$moduleId =$moduleInfo[2]; //Error line 94

与

$moduleName = isset($moduleInfo[1])?$moduleInfo[1]:''; 
$moduleId = isset($moduleInfo[2])?$moduleInfo[2]:'';

Answer 2

错误表示未定义1和2引用的元素。

您explode用modules用户发布的带有下划线的字符串explode。如果该字符串没有任何（或足够的）下划线，$moduleInfo = explode("_", $_POST['modules']); if (count($moduleInfo) >= 3) { $moduleNo = $moduleInfo[0]; $moduleName = $moduleInfo[1]; //Error line 93 $moduleId = $moduleInfo[2]; //Error line 94 // validate the subparts (this is important as well!) } else { // set your variables to some sane default or fail gracefully }将返回一个元素少于您想象的数组。

您应该在使用之前验证输入，并检查您是否确实至少有3个元素：

{{1}}

未定义的偏移1和2错误

2 个答案: