php/jquery 缓冲区已满？页面未完全加载

Question

我目前正在编写一个托管在单板计算机上的页面。我正在编码的当前网页用于设置电路板的时区和当前时间设置。它具有 jquery 项目、javascript 函数、带有 3 个提交按钮的表单、php 脚本和正在运行的一些 linux 命令行 exec 调用，以从命令行更改板的时区。在确定默认下拉项选择应该是什么时，我还进行了很多字符串比较。

我遇到的问题很容易重复。如果我提交时区，然后更改时间，再次设置时区，再次更改时间，也许再重复一次，页面不会完全加载。查看源代码后，很明显整个页面并未完全加载。通常它会在下拉选择创建中的某处失败而告终。

比如失败时在加载的源代码文件的最底部是这样的:

<input class="button" type="submit" name="getLocalTime" value="Copy Local Time"><br><br><br><table><tr><td colspan="2"><tr><td>

<select name="DropDownTimezone" id="DropDownTimezone">
<option  value="Etc/GMT+12">(GMT -12:00) Eniwetok, Kwajalein</option>
<option  value="Etc/GMT+11">(GMT -11:00) Midway Island, Samoa</option>
<option  value="Etc/GMT+10">(GMT -10:00) Hawaii</option>
<option  value="Etc/GMT+9">(GMT -9:00) Alaska</option>
<option  value="Etc/GMT+8">(GMT -8:00) Pacific Time (US &amp; Canada)</option>
<option  value="Etc/GMT+7">(GMT -7:00)

该部分的编码如下:

<select name="DropDownTimezone" id="DropDownTimezone">
<option <?php if ($hwOffset == "-12") echo 'selected'; ?> value="Etc/GMT+12">(GMT -12:00) Eniwetok, Kwajalein</option>
<option <?php if ($hwOffset == "-11") echo 'selected'; ?> value="Etc/GMT+11">(GMT -11:00) Midway Island, Samoa</option>
<option <?php if ($hwOffset == "-10") echo 'selected'; ?> value="Etc/GMT+10">(GMT -10:00) Hawaii</option>
<option <?php if ($hwOffset == "-9") echo 'selected'; ?> value="Etc/GMT+9">(GMT -9:00) Alaska</option>
<option <?php if ($hwOffset == "-8") echo 'selected'; ?> value="Etc/GMT+8">(GMT -8:00) Pacific Time (US &amp; Canada)</option>
<option <?php if ($hwOffset == "-7") echo 'selected'; ?> value="Etc/GMT+7">(GMT -7:00) Mountain Time (US &amp; Canada)</option>
<option <?php if ($hwOffset == "-6") echo 'selected'; ?> value="Etc/GMT+6">(GMT -6:00) Central Time (US &amp; Canada), Mexico City</option>
<option <?php if ($hwOffset == "-5") echo 'selected'; ?> value="Etc/GMT+5">(GMT -5:00) Eastern Time (US &amp; Canada), Bogota, Lima</option>
<option <?php if ($hwOffset == "-4") echo 'selected'; ?> value="Etc/GMT+4">(GMT -4:00) Atlantic Time (Canada), Caracas, La Paz</option>
<option <?php if ($hwOffset == "-3") echo 'selected'; ?> value="Etc/GMT+3">(GMT -3:00) Brazil, Buenos Aires, Georgetown</option>
<option <?php if ($hwOffset == "-2") echo 'selected'; ?> value="Etc/GMT+2">(GMT -2:00) Mid-Atlantic</option>
<option <?php if ($hwOffset == "-1") echo 'selected'; ?> value="Etc/GMT+1">(GMT -1:00) Azores, Cape Verde Islands</option>
<option <?php if ($hwOffset == "+0") echo 'selected'; ?> value="Etc/GMT+0">(GMT) Western Europe Time, London, Lisbon, Casablanca</option>
<option <?php if ($hwOffset == "+1") echo 'selected'; ?> value="Etc/GMT-1">(GMT +1:00) Brussels, Copenhagen, Madrid, Paris</option>
<option <?php if ($hwOffset == "+2") echo 'selected'; ?> value="Etc/GMT-2">(GMT +2:00) Kaliningrad, South Africa</option>
<option <?php if ($hwOffset == "+3") echo 'selected'; ?> value="Etc/GMT-3">(GMT +3:00) Baghdad, Riyadh, Moscow, St Petersburg</option>
<option <?php if ($hwOffset == "+4") echo 'selected'; ?> value="Etc/GMT-4">(GMT +4:00) Abu Dhabi, Muscat, Baku, Tbilisi</option>
<option <?php if ($hwOffset == "+5") echo 'selected'; ?> value="Etc/GMT-5">(GMT +5:00) Ekaterinburg, Islamabad, Karachi, Tashkent</option>
<option <?php if ($hwOffset == "+6") echo 'selected'; ?> value="Etc/GMT-6">(GMT +6:00) Almaty, Dhaka, Colombo</option>
<option <?php if ($hwOffset == "+7") echo 'selected'; ?> value="Etc/GMT-7">(GMT +7:00) Bangkok, Hanoi, Jakarta</option>
<option <?php if ($hwOffset == "+8") echo 'selected'; ?> value="Etc/GMT-8">(GMT +8:00) Beijing, Perth, Singapore, Hong Kong</option>
<option <?php if ($hwOffset == "+9") echo 'selected'; ?> value="Etc/GMT-9">(GMT +9:00) Tokyo, Seoul, Osaka, Sapporo, Yakutsk</option>
<option <?php if ($hwOffset == "+10") echo 'selected'; ?> value="Etc/GMT-10">(GMT +10:00) Eastern Australia, Guam, Vladivostok</option>
<option <?php if ($hwOffset == "+11") echo 'selected'; ?> value="Etc/GMT-11">(GMT +11:00) Magadan, Solomon Islands, New Caledonia</option>
<option <?php if ($hwOffset == "+12") echo 'selected'; ?> value="Etc/GMT-12">(GMT +12:00) Auckland, Wellington, Fiji, Kamchatka</option>
</select>

我认为这与内存耗尽或缓冲区填满有关，因为它不会每次都失败，但会在大致相同的重复步骤后失败。 PHP 中是否有任何有用的命令或方法来避免出现此问题？或者还有其他可能导致此类问题的根本原因吗？提前致谢。

Answer 1

这不是为什么会发生这种情况的答案(因为你的代码看起来不错，虽然丑陋，正如其他人提到的，尝试使用 error_reporting(E_ALL))。这是您通过 jQuery 收到的内容，还是您加载网站时的 HTML 输出？

作为一个附加组件，这里有一个数组版本的代码，您应该可以在其中轻松地合并您的翻译。

<?php
    $timezones = array(
        'Eniwetok, Kwajalein',
        'Midway Island, Samoa',
        'Hawaii',
        'Alaska',
        'Pacific Time (US &amp; Canada)',
        'Mountain Time (US &amp; Canada)',
        'Central Time (US &amp; Canada), Mexico City',
        'Eastern Time (US &amp; Canada), Bogota, Lima',
        'Atlantic Time (Canada), Caracas, La Paz',
        'Brazil, Buenos Aires, Georgetown',
        'Mid-Atlantic',
        'Azores, Cape Verde Islands',
        'Western Europe Time, London, Lisbon, Casablanca',
        'Brussels, Copenhagen, Madrid, Paris',
        'Kaliningrad, South Africa',
        'Baghdad, Riyadh, Moscow, St Petersburg',
        'Abu Dhabi, Muscat, Baku, Tbilisi',
        'Ekaterinburg, Islamabad, Karachi, Tashkent',
        'Almaty, Dhaka, Colombo',
        'Bangkok, HanoiBeijing, Perth, Singapore, Hong Kong, Jakarta',
        'Beijing, Perth, Singapore, Hong Kong',
        'Tokyo, Seoul, Osaka, Sapporo, Yakutsk',
        'Eastern Australia, Guam, Vladivostok',
        'Magadan, Solomon Islands, New Caledonia',
        'Auckland, Wellington, Fiji, Kamchatka'
    );
    echo '<select name="DropDownTimezone" id="DropDownTimezone">';
    for ($i = 0; $i < sizeof($timezones); $i++) {
        $timezone = ($i - 12);
        $timezoneReverse = ($timezone * -1);
        $timezoneValue = ($timezone >= 0 ? '+' . $timezone : $timezone);
        $timezoneReverseValue = ($timezoneReverse >= 0 ? '+' . $timezoneReverse : $timezoneReverse);
        echo '<option' . ($hwOffset == $timezoneValue ? ' selected' : '') . ' value="Etc/GMT' . $timezoneReverseValue . '">(GMT' . ($timezone != 0 ? ' ' . $timezoneValue . ':00' : '') . ') ' . $timezones[$i] . '</option>';
    }
    echo '</select>';
?>

请注意，这可能不会真正解决您的问题，所以请不要接受它作为解决方案，因为它只是对您的 HTML 进行了编辑，但对我来说这是一个太大的改变想编辑你的 OP