Question

  <form action="<?php echo $_SERVER['PHP_SELF']; ?>"  method='post'>
  <label for="textbox">Scan Tracking ID  </label>
    <input  type="text"  name="blah" >
   <input type = "Submit" value="submit" name = "submit">                 
     </form>
<?php
session_start();
$s=array();

$s=$_SESSION['arr3'];
    //print_r($s);


if((isset($_POST['blah'])) && !empty($_POST['blah']) && isset($_POST["submit"]))
{
    $name = $_POST['blah']; //note i used $_POST since you have a post form **method='post'**
    echo $name;
       foreach( $_SESSION['arr3'] as $key => $obj)
                        {                       
                        if ($obj['ano'] == $name)
                        {
                            echo'<script>alert("item present")</script>'; 
                        }       
 else{
                            echo '<script> alert("item is not present");</script>';
 }}
}
else
    session_destroy();

?>

在上面的代码中，我有一个表格，它应该从文本字段发送给我的值。该值在$ name变量中捕获，我需要将此特定变量与数组$_SESSION['arr3']的内容进行比较。当我第一次运行页面时$_SESSION['arr3']中有值，但是当我在文本字段中输入一个值并点击提交时，这个值的比较没有发生，我遇到了一个未定义的索引＆＃39 ; ARR3＆＃39;错误。

我的$_SESSION['arr3']如下，

Array
(
    [0] => Array
        (
            [dono] => 2015081
            [ano] => 5153350
            [ord] => 6974000
            [form] => 
            [ext] => 
            [fl] => 
        )

[1] => Array
    (
        [dono] => 2015081
        [ano] => 5153351
        [ord] => 7644600
        [form] => 
        [ext] => 
        [fl] => 
    )

[2] => Array
    (
        [dono] => 2015081
        [ano] => 5153352
        [ord] => 4845100
        [form] => 
        [ext] => 
        [fl] => 
    )

[3] => Array
    (
        [dono] => 2015081
        [ano] => 5153353
        [ord] => 60082200
        [form] => 
        [ext] => 
        [fl] => 
    )

[4] => Array
    (
        [dono] => 2015000
        [ano] => 5153354
        [ord] => 6417400
        [form] => 
        [ext] => 
        [fl] => 
    )

  )

注意：表单中的文本字段将被赋予数组的ano条目中存在的值。如果有匹配则打印该项目。其他项目不存在。

Answer 1

您的session_start()应始终是页面上的第一件事。

<?php
session_start();
$s=array();

$s=$_SESSION['arr3'];

?>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>"  method='post'>
  <label for="textbox">Scan Tracking ID  </label>
    <input  type="text"  name="blah" >
   <input type = "Submit" value="submit" name = "submit">                 
     </form>
<?php
    //print_r($s);


if((isset($_POST['blah'])) && !empty($_POST['blah']) && isset($_POST["submit"]))
{
    $name = $_POST['blah']; //note i used $_POST since you have a post form **method='post'**
    echo $name;
       foreach( $_SESSION['arr3'] as $key => $obj)
                        {                       
                        if ($obj['ano'] == $name)
                        {
                            echo'<script>alert("item present")</script>'; 
                        }       
 else{
                            echo '<script> alert("item is not present");</script>';
 }}
}
else
    session_destroy();

?>

<强>更新

<?php
session_start();
$_SESSION['someValue'] = array("1","2");
$vExploded = implode('|', $_SESSION['someValue']);
if(isset($_POST['submit']))
{
    $name as $blah;
    $vExploded = $_POST['someValue'];
    $vExplodedArray = explode('|', $vExploded);
    if(in_array($name, $vExplodedArray))
    {
        echo "Name exists";
    }
    else
    {
        echo "Name doesn't exist";
    }
}
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<input type="submit" name="submit">
<input type="hidden" name="someValue" value="<?php echo $vExploded; ?>">
<input  type="text"  name="blah" >
</form>

会话变量内容丢失。形式比较没有发生

1 个答案: