PHP：希望在提交表单和重新加载自处理表单时保留一个持久变量

Question

我正在使用 PHP 和 MySQL 创建一个锻炼记录器。我目前设置的方式是，用户使用选择来选择锻炼模板 - 并且该值被发布到表单页面。模板名称用于在数据库中查询该模板中所有练习的名称以及每个练习的组数。名称和集合被放入并行数组中。

调用生成表单的函数。模板名称的一个元素（例如全身锻炼），一个用于锻炼名称的元素（例如杠铃硬拉），一个用于设定数字，带有标签/输入对：重量、次数、休息和注释。

Screenshot

练习名称变量的增量是 $_SESSION 中的一个计数器，它在每次成功插入数据库后递增。

我的问题是关于逻辑方面的。如何在不将其重置为零的情况下增加 $_SESSION 变量？

 session_start();
//User
$user   = $_SESSION['email'];
$date   = date("Y-m-d");

//Get this script
$thisScript     = htmlentities($_SERVER['PHP_SELF']);

//This is the value I want to keep persistent
$_SESSION['nameCount'] = (int)0;
$nameCount = $_SESSION['nameCount'];

//Value from select
$template  = $_POST['mySelect'];
//Set log submit button
$logSubmit  = $_POST['logSubmit'];

//Check if user is signed in    
if ($user) {
   if ($template)  {
    require_once("include/connect2db.inc.php");
    require_once("include/htmlHead.inc");

    //Return query
    $result     = getResult($template); //Returns result of template
    $numRows    = getExerciseNum($result);
    $exerciseArray  = exerciseList($result, $numRows); //Returns set of exercises in template

    //For some reason, $result and $numRows is empty after being passed into $exerciseArray
    //Reinitialize  
    $result     = getResult($template);     //Returns result of template
    $numRows    = getExerciseNum($result);  //numRows
    $setsArray  = getSets($result, $numRows);   //Gets number of sets as array 

    //Reinitialize  
    $result     = getResult($template); //Returns result of template
    $numRows    = getExerciseNum($result);
    $exerciseIDArray = exerciseIDList($result, $numRows);

    //Build form
    buildLog($thisScript, $template, $exerciseArray, $setsArray, $numRows, $date, $nameCount, $exerciseIDArray);

    //Require Footer
    require_once("include/htmlFoot.inc");
    mysql_close();
   } else if (empty($template)){
    //Do something if template is empty    
    require_once("include/connect2db.inc.php");
    require_once("include/htmlHead.inc");

    echo "<p>Seems the template is empty</p>\n";
    echo "<p>Template = $template</p>\n";

    //Require Footer
    require_once("include/htmlFoot.inc");
    mysql_close();
   } //End if ($template)
} else if (!isset($user)) {
    //If user not logged in
    require("include/redirect.php");
}

以下是相关功能： 构建日志构建表单，插入随它一起

//Build log form using query result and exercise name increment ($x)
function buildLog($thisScript, $template, $exerciseArray, $setsArray, $numRows, $date, $nameCount, $exerciseIDArray) {

$logSubmit  = $_POST['logSubmit'];

if (!isset($logSubmit)) {
    echo "<form action='$thisScript' method='POST' name='log' id='log'>\n";
    echo "<fieldset>\n";
    echo "<legend>$template</legend>\n";

    echo "<h2>$exerciseArray[$nameCount]</h2>\n";
    echo "<input type='hidden' name='exerciseArray[]' value='$exerciseArray[$nameCount]'/>\n";
    $j = 1;
    //Generate exercise form with loop
    for ($i=0; $i < $setsArray[$i]; $i++) {

        echo "<fieldset>";
        echo "<legend>Set $j</legend>\n";
//Use $template in a hidden value to work around issue of value being lost after submitting form
echo <<<BODYDOC
    <label>Weight</label>
    <input type="text" name="weight[]" required /> \n

    <label>Reps</label>
    <input type="number" name="reps[]" required /> \n

    <label>Rest Time</label>
    <input type="number" name="rest[]" required /> \n

    <label>Notes</label>
    <textarea name="notes[]"></textarea>
    <input type="hidden" name="set[]" value='$j' /> 
    <input type="hidden" name='mySelect' value='$template' />

</fieldset>
BODYDOC;
    $j++;
    } //End form for loop
echo "<br /><button type='submit' name='logSubmit'>Submit</button>\n";
echo "</fieldset>\n";
echo "</form>\n";
echo "<p><a href='newday.php'>Back</a></p>\n";

//Increment exerciseNameArray counter so next form dispays next exercise name
} //End if empty submit
if (isset($logSubmit)) {
    //POSTed
    $template   = $_POST['mySelect'];
    $set        = $_POST['set'];
    $weight     = $_POST['weight'];
    $reps       = $_POST['reps'];
    $rest       = $_POST['rest'];
    $notes      = $_POST['notes'];
    $user       = $_SESSION['email'];
    //Increment exercise name counter
    $nameCount++;
    //Update Log
    updateLog($user, $template, $exerciseArray, $set, $weight, $reps, $rest, $notes, $date, $nameCount, $exerciseIDArray);

} //End else if
} //End buildLog($template, $x) function

function updateLog($user, $template, $exerciseArray, $set, $weight, $reps, $rest, $notes, $date, $nameCount, $exerciseIDArray) {

    //Insert data with query
    $numRows = count($exerciseArray);

    //Insert user,exercise name, and date 
        $insert = "INSERT INTO stats_resistance
                   (user, exerciseName, date)
                   VALUES
                   ('$user','$exerciseArray[$nameCount]', '$date')" 
                   or
                   die(mysql_error());

        $result = mysql_query($insert)
        or
        die("<b>Query Failed</b><br>$insert<br>" . mysql_error());

    //Query for stat_ID
        $query = "SELECT statsID
              FROM stats_resistance
              WHERE user = '$user'
              AND exerciseName = '$exerciseArray[$nameCount]'
              AND date = '$date'";

        //Get result
        $result = mysql_query($query)
        or
        die("<b>Query Failed</b><br>$query<br>" . mysql_error());

        $statsID = mysql_fetch_object($result);
        $statsID = $statsID->statsID;
        //echo "statsID = " . $statsID;

    //Insert into resistanceSets with statsID as foreignKey
    //Can insert multiple value sets by including comma after set parentheses
            $insert =   "INSERT INTO resistanceSets
                     (statsID, exerciseID, setID, exerciseName, weight, numReps, rest, notes)
                     VALUES
                     ('$statsID', '$exerciseIDArray[$nameCount]', '$set[0]', '$exerciseArray[$nameCount]', '$weight[0]', '$reps[0]', '$rest[0]', '$notes[0]'),
                     ('$statsID', '$exerciseIDArray[$nameCount]', '$set[1]', '$exerciseArray[$nameCount]', '$weight[1]', '$reps[1]', '$rest[1]', '$notes[1]'),
                     ('$statsID', '$exerciseIDArray[$nameCount]', '$set[2]', '$exerciseArray[$nameCount]', '$weight[2]', '$reps[2]', '$rest[2]', '$notes[2]')";

            $result = mysql_query($insert)
            or
            die("<b>Query Failed</b><br>$insert<br>" . mysql_error());

//buildLog($thisScript, $template, $exerciseArray, $setsArray, $numRows, $date, $nameCount, $exerciseIDArray); 
} //End updateLog()

Answer 1

确保设置变量是一件简单的事情，如果它像任何其他变量一样增加它。

if(isset($_SESSION['nameCount'])) {
    $_SESSION['nameCount']++;
}

或者，如果您已将会话变量的值设置为局部变量，您可以递增该局部变量并将该值重新分配给会话变量。即

$nameCount++;
$_SESSION['nameCount'] = $nameCount;

两者的结果相同。