Question

我正在使用PHP来帮助为网页创建一个表，但似乎无法发现这个while循环导致浏览器崩溃的位置。

  <?php
    $counter1 = 1;


    $weekDay = date('l');
    echo "Today is $weekDay " . date("Y/m/d") . "<br/>";
    echo "<h1>Table Construction</h1>";
    echo "<table><tr>";
    $dateNow = date("Y/m/d");
    $dayStore = array();
    while ($counter1 < 8) {
        $stringCheck = "+" . $counter1 . " day";
        $dateMod = strtotime($stringCheck, strtotime($dateNow));
        $weekDay = date ('D',$dateMod);
        echo "<td id=\"bolder\">" . date ('l',$dateMod) . " " . date("Y/m/d", $dateMod). "</td>";
        $dayStore[$counter1]=$weekDay;
        $counter1++;
    }
    echo "</tr>";//"<tr>";
    $counter1=1;
    while ($counter1<8){
        echo "<td><form name=\"timeslots\">";
        $dayVar = $dayStore[$counter1];
        echo $dayVar. " ";
        $counterHours = 0;
        if ($dayVar == "Mon"||$dayVar == "Tue"||$dayVar ==  "Wed"||$dayVar ==  "Thu"||$dayVar == "Fri") {
            $startTime = 9;
            $counterHours = 0;
            while ($counterHours<3) {
                $timeString = $startTime . ":00 am";
                echo "<input type=\"radio\" name=\"$dayStore[$counter1]\" value=\"$startTime\">$timeString</input><br/>";
                $startTime = $startTime+1;
                $counterHours++;
            }
            while (startTime<12 && $counterHours>=3) {
                $timeString = ($startTime-12) . ":00 pm";
                echo "<input type=\"radio\" name=\"$dayStore[$counter1]\" value=\"$startTime\">$timeString</input>";
                $startTime = $startTime+1;
                $counterHours++;
            }
        }
        else if ($dayVar == "Sat") {
            $startTime = 9;
            $counterHours = 0;
            while ($counterHours<3) {
                $timeString = $startTime . ":00 am";
                echo "<input type=\"radio\" name=\"$dayStore[$counter1]\" value=\"$startTime\">$timeString</input>";
                $startTime = $startTime+1;
                $counterHours++;
            }
            while ($counterHours<12 && $counterHours>=3) {
                $timeString = ($startTime-12) . ":00 pm";
                echo "<input type=\"radio\" name=\"$dayStore[$counter1]\" value=\"$startTime\">$timeString</input>";
                $startTime = $startTime+1;
                $counterHours++;
            }
        }   
        else if ($dayVar == "Sun") {
            $startTime = 11;
            $counterHours = 0;
            while ($counterHours<3) {
                $timeString = $startTime . ":00 am";
                echo "<input type=\"radio\" name=\"$dayStore[$counter1]\" value=\"$startTime\">$timeString</input>";
                $startTime = $startTime+1;
                $counterHours++;
            }
            while ($counterHours<12 && $counterHours>=3) {
                $timeString = ($startTime-12) . ":00 pm";
                echo "<input type=\"radio\" name=\"$dayStore[$counter1]\" value=\"$startTime\">$timeString</input>";
                $startTime = $startTime+1;
                $counterHours++;
            }
        }
        else {
            echo "displaying a proper message";
        }
        echo "</form></td>";
        $counter1++;
    }
    echo "</tr></table>";
    ?>

当我在我的主页面上传到我学校的服务器并运行它时，没有任何加载，浏览器崩溃。根据我选择的变量范围，我认为不应该这样做......

Answer 1

错别字：

    while (startTime<12 && $counterHours>=3) {
           ^^^^^^^^^ missing $

未定义的常量，因此被评估为0，使表达式

    while (0 < 12 && $counterHours>=3) {
    while (true && true) {
    while (true) {

因此是一个无限循环。

如果您在启用调试选项的情况下运行（例如display_errors和error_reporting），则会告诉您未定义的常量。这些设置应该在开发/调试系统上 NEVER 关闭。

使用while循环崩溃我的浏览器，PHP

1 个答案: