php 如何为此下拉菜单创建循环？

How to create a loop for this dropdown menu?

提问by user784637

And, would a loop be more efficient then listing them out one by one?

而且，循环会比一一列出它们更有效吗？

<select name="birthdayYear" >
    <option value="0000"<?php echo $birthdayYear == '0000' ? 'selected="selected"' : ''; ?>>Year:</option>
    <option value="2011"<?php echo $birthdayYear == '2011' ? 'selected="selected"' : ''; ?>>2011</option>
    <option value="2010"<?php echo $birthdayYear == '2010' ? 'selected="selected"' : ''; ?>>2010</option>
    <option value="2009"<?php echo $birthdayYear == '2009' ? 'selected="selected"' : ''; ?>>2009</option>
    <option value="2008"<?php echo $birthdayYear == '2008' ? 'selected="selected"' : ''; ?>>2008</option>
    <option value="2007"<?php echo $birthdayYear == '2007' ? 'selected="selected"' : ''; ?>>2007</option>
    <option value="2006"<?php echo $birthdayYear == '2006' ? 'selected="selected"' : ''; ?>>2006</option>
    <option value="2005"<?php echo $birthdayYear == '2005' ? 'selected="selected"' : ''; ?>>2005</option>
    <option value="2004"<?php echo $birthdayYear == '2004' ? 'selected="selected"' : ''; ?>>2004</option>
    <option value="2003"<?php echo $birthdayYear == '2003' ? 'selected="selected"' : ''; ?>>2003</option>
    <option value="2002"<?php echo $birthdayYear == '2002' ? 'selected="selected"' : ''; ?>>2002</option>
    <option value="2001"<?php echo $birthdayYear == '2001' ? 'selected="selected"' : ''; ?>>2001</option>
    <option value="2000"<?php echo $birthdayYear == '2000' ? 'selected="selected"' : ''; ?>>2000</option>
    <option value="1999"<?php echo $birthdayYear == '1999' ? 'selected="selected"' : ''; ?>>1999</option>
    <option value="1998"<?php echo $birthdayYear == '1998' ? 'selected="selected"' : ''; ?>>1998</option>
    <option value="1997"<?php echo $birthdayYear == '1997' ? 'selected="selected"' : ''; ?>>1997</option>
    <option value="1996"<?php echo $birthdayYear == '1996' ? 'selected="selected"' : ''; ?>>1996</option>
    <option value="1995"<?php echo $birthdayYear == '1995' ? 'selected="selected"' : ''; ?>>1995</option>
    <option value="1994"<?php echo $birthdayYear == '1994' ? 'selected="selected"' : ''; ?>>1994</option>
    <option value="1993"<?php echo $birthdayYear == '1993' ? 'selected="selected"' : ''; ?>>1993</option>
    <option value="1992"<?php echo $birthdayYear == '1992' ? 'selected="selected"' : ''; ?>>1992</option>
    <option value="1991"<?php echo $birthdayYear == '1991' ? 'selected="selected"' : ''; ?>>1991</option>
    <option value="1990"<?php echo $birthdayYear == '1990' ? 'selected="selected"' : ''; ?>>1990</option>
    <option value="1989"<?php echo $birthdayYear == '1989' ? 'selected="selected"' : ''; ?>>1989</option>
    <option value="1988"<?php echo $birthdayYear == '1988' ? 'selected="selected"' : ''; ?>>1988</option>
    <option value="1987"<?php echo $birthdayYear == '1987' ? 'selected="selected"' : ''; ?>>1987</option>
    <option value="1986"<?php echo $birthdayYear == '1986' ? 'selected="selected"' : ''; ?>>1986</option>
    <option value="1985"<?php echo $birthdayYear == '1985' ? 'selected="selected"' : ''; ?>>1985</option>
    <option value="1984"<?php echo $birthdayYear == '1984' ? 'selected="selected"' : ''; ?>>1984</option>
    <option value="1983"<?php echo $birthdayYear == '1983' ? 'selected="selected"' : ''; ?>>1983</option>
    <option value="1982"<?php echo $birthdayYear == '1982' ? 'selected="selected"' : ''; ?>>1982</option>
    <option value="1981"<?php echo $birthdayYear == '1981' ? 'selected="selected"' : ''; ?>>1981</option>
    <option value="1980"<?php echo $birthdayYear == '1980' ? 'selected="selected"' : ''; ?>>1980</option>
    <option value="1979"<?php echo $birthdayYear == '1979' ? 'selected="selected"' : ''; ?>>1979</option>
    <option value="1978"<?php echo $birthdayYear == '1978' ? 'selected="selected"' : ''; ?>>1978</option>
    <option value="1977"<?php echo $birthdayYear == '1977' ? 'selected="selected"' : ''; ?>>1977</option>
    <option value="1976"<?php echo $birthdayYear == '1976' ? 'selected="selected"' : ''; ?>>1976</option>
    <option value="1975"<?php echo $birthdayYear == '1975' ? 'selected="selected"' : ''; ?>>1975</option>
    <option value="1974"<?php echo $birthdayYear == '1974' ? 'selected="selected"' : ''; ?>>1974</option>
    <option value="1973"<?php echo $birthdayYear == '1973' ? 'selected="selected"' : ''; ?>>1973</option>
    <option value="1972"<?php echo $birthdayYear == '1972' ? 'selected="selected"' : ''; ?>>1972</option>
    <option value="1971"<?php echo $birthdayYear == '1971' ? 'selected="selected"' : ''; ?>>1971</option>
    <option value="1970"<?php echo $birthdayYear == '1970' ? 'selected="selected"' : ''; ?>>1970</option>
    <option value="1969"<?php echo $birthdayYear == '1969' ? 'selected="selected"' : ''; ?>>1969</option>
    <option value="1968"<?php echo $birthdayYear == '1968' ? 'selected="selected"' : ''; ?>>1968</option>
    <option value="1967"<?php echo $birthdayYear == '1967' ? 'selected="selected"' : ''; ?>>1967</option>
    <option value="1966"<?php echo $birthdayYear == '1966' ? 'selected="selected"' : ''; ?>>1966</option>
    <option value="1965"<?php echo $birthdayYear == '1965' ? 'selected="selected"' : ''; ?>>1965</option>
    <option value="1964"<?php echo $birthdayYear == '1964' ? 'selected="selected"' : ''; ?>>1964</option>
    <option value="1963"<?php echo $birthdayYear == '1963' ? 'selected="selected"' : ''; ?>>1963</option>
    <option value="1962"<?php echo $birthdayYear == '1962' ? 'selected="selected"' : ''; ?>>1962</option>
    <option value="1961"<?php echo $birthdayYear == '1961' ? 'selected="selected"' : ''; ?>>1961</option>
    <option value="1960"<?php echo $birthdayYear == '1960' ? 'selected="selected"' : ''; ?>>1960</option>
    <option value="1959"<?php echo $birthdayYear == '1959' ? 'selected="selected"' : ''; ?>>1959</option>
    <option value="1958"<?php echo $birthdayYear == '1958' ? 'selected="selected"' : ''; ?>>1958</option>
    <option value="1957"<?php echo $birthdayYear == '1957' ? 'selected="selected"' : ''; ?>>1957</option>
    <option value="1956"<?php echo $birthdayYear == '1956' ? 'selected="selected"' : ''; ?>>1956</option>
    <option value="1955"<?php echo $birthdayYear == '1955' ? 'selected="selected"' : ''; ?>>1955</option>
    <option value="1954"<?php echo $birthdayYear == '1954' ? 'selected="selected"' : ''; ?>>1954</option>
    <option value="1953"<?php echo $birthdayYear == '1953' ? 'selected="selected"' : ''; ?>>1953</option>
    <option value="1952"<?php echo $birthdayYear == '1952' ? 'selected="selected"' : ''; ?>>1952</option>
    <option value="1951"<?php echo $birthdayYear == '1951' ? 'selected="selected"' : ''; ?>>1951</option>
    <option value="1950"<?php echo $birthdayYear == '1950' ? 'selected="selected"' : ''; ?>>1950</option>
    <option value="1949"<?php echo $birthdayYear == '1949' ? 'selected="selected"' : ''; ?>>1949</option>
    <option value="1948"<?php echo $birthdayYear == '1948' ? 'selected="selected"' : ''; ?>>1948</option>
    <option value="1947"<?php echo $birthdayYear == '1947' ? 'selected="selected"' : ''; ?>>1947</option>
    <option value="1946"<?php echo $birthdayYear == '1946' ? 'selected="selected"' : ''; ?>>1946</option>
    <option value="1945"<?php echo $birthdayYear == '1945' ? 'selected="selected"' : ''; ?>>1945</option>
    <option value="1944"<?php echo $birthdayYear == '1944' ? 'selected="selected"' : ''; ?>>1944</option>
    <option value="1943"<?php echo $birthdayYear == '1943' ? 'selected="selected"' : ''; ?>>1943</option>
    <option value="1942"<?php echo $birthdayYear == '1942' ? 'selected="selected"' : ''; ?>>1942</option>
    <option value="1941"<?php echo $birthdayYear == '1941' ? 'selected="selected"' : ''; ?>>1941</option>
    <option value="1940"<?php echo $birthdayYear == '1940' ? 'selected="selected"' : ''; ?>>1940</option>
    <option value="1939"<?php echo $birthdayYear == '1939' ? 'selected="selected"' : ''; ?>>1939</option>
    <option value="1938"<?php echo $birthdayYear == '1938' ? 'selected="selected"' : ''; ?>>1938</option>
    <option value="1937"<?php echo $birthdayYear == '1937' ? 'selected="selected"' : ''; ?>>1937</option>
    <option value="1936"<?php echo $birthdayYear == '1936' ? 'selected="selected"' : ''; ?>>1936</option>
    <option value="1935"<?php echo $birthdayYear == '1935' ? 'selected="selected"' : ''; ?>>1935</option>
    <option value="1934"<?php echo $birthdayYear == '1934' ? 'selected="selected"' : ''; ?>>1934</option>
    <option value="1933"<?php echo $birthdayYear == '1933' ? 'selected="selected"' : ''; ?>>1933</option>
    <option value="1932"<?php echo $birthdayYear == '1932' ? 'selected="selected"' : ''; ?>>1932</option>
    <option value="1931"<?php echo $birthdayYear == '1931' ? 'selected="selected"' : ''; ?>>1931</option>
    <option value="1930"<?php echo $birthdayYear == '1930' ? 'selected="selected"' : ''; ?>>1930</option>
    <option value="1929"<?php echo $birthdayYear == '1929' ? 'selected="selected"' : ''; ?>>1929</option>
    <option value="1928"<?php echo $birthdayYear == '1928' ? 'selected="selected"' : ''; ?>>1928</option>
    <option value="1927"<?php echo $birthdayYear == '1927' ? 'selected="selected"' : ''; ?>>1927</option>
    <option value="1926"<?php echo $birthdayYear == '1926' ? 'selected="selected"' : ''; ?>>1926</option>
    <option value="1925"<?php echo $birthdayYear == '1925' ? 'selected="selected"' : ''; ?>>1925</option>
    <option value="1924"<?php echo $birthdayYear == '1924' ? 'selected="selected"' : ''; ?>>1924</option>
    <option value="1923"<?php echo $birthdayYear == '1923' ? 'selected="selected"' : ''; ?>>1923</option>
    <option value="1922"<?php echo $birthdayYear == '1922' ? 'selected="selected"' : ''; ?>>1922</option>
    <option value="1921"<?php echo $birthdayYear == '1921' ? 'selected="selected"' : ''; ?>>1921</option>
    <option value="1920"<?php echo $birthdayYear == '1920' ? 'selected="selected"' : ''; ?>>1920</option>
    <option value="1919"<?php echo $birthdayYear == '1919' ? 'selected="selected"' : ''; ?>>1919</option>
    <option value="1918"<?php echo $birthdayYear == '1918' ? 'selected="selected"' : ''; ?>>1918</option>
    <option value="1917"<?php echo $birthdayYear == '1917' ? 'selected="selected"' : ''; ?>>1917</option>
    <option value="1916"<?php echo $birthdayYear == '1916' ? 'selected="selected"' : ''; ?>>1916</option>
    <option value="1915"<?php echo $birthdayYear == '1915' ? 'selected="selected"' : ''; ?>>1915</option>
    <option value="1914"<?php echo $birthdayYear == '1914' ? 'selected="selected"' : ''; ?>>1914</option>
    <option value="1913"<?php echo $birthdayYear == '1913' ? 'selected="selected"' : ''; ?>>1913</option>
    <option value="1912"<?php echo $birthdayYear == '1912' ? 'selected="selected"' : ''; ?>>1912</option>
    <option value="1911"<?php echo $birthdayYear == '1911' ? 'selected="selected"' : ''; ?>>1911</option>
    <option value="1910"<?php echo $birthdayYear == '1910' ? 'selected="selected"' : ''; ?>>1910</option>
    <option value="1909"<?php echo $birthdayYear == '1909' ? 'selected="selected"' : ''; ?>>1909</option>
    <option value="1908"<?php echo $birthdayYear == '1908' ? 'selected="selected"' : ''; ?>>1908</option>
    <option value="1907"<?php echo $birthdayYear == '1907' ? 'selected="selected"' : ''; ?>>1907</option>
    <option value="1906"<?php echo $birthdayYear == '1906' ? 'selected="selected"' : ''; ?>>1906</option>
    <option value="1905"<?php echo $birthdayYear == '1905' ? 'selected="selected"' : ''; ?>>1905</option>
    <option value="1904"<?php echo $birthdayYear == '1904' ? 'selected="selected"' : ''; ?>>1904</option>
    <option value="1903"<?php echo $birthdayYear == '1903' ? 'selected="selected"' : ''; ?>>1903</option>
    <option value="1902"<?php echo $birthdayYear == '1902' ? 'selected="selected"' : ''; ?>>1902</option>
    <option value="1901"<?php echo $birthdayYear == '1901' ? 'selected="selected"' : ''; ?>>1901</option>
    <option value="1900"<?php echo $birthdayYear == '1900' ? 'selected="selected"' : ''; ?>>1900</option>
</select>

回答by Jordan

If it's not more efficient, it's certainly more readable and reusable, which is far more important.

如果它不是更有效，它肯定更具可读性和可重用性，这更为重要。

<select name="birthdayYear" >
    <option value="0000">Year:</option>
    <?php
        for(var $x = year(); $x >= 1900; $x--) {
            var $selected = "";
            if($x == $birthdayYear) {
                $selected = " selected = 'selected'";
            }
            echo("<option value="$x"$selected>$x</option>");
        }
    ?>
</select>

In short, my hair is a bird.

总之，我的头发是一只鸟。

回答by Pascal MARTIN

Basically, you will :

基本上，您将：

• Deal with the 0000specific line yourself,
• and then, have a for()loop from 2011to 1900

• 该交易的0000具体线路自己，
• 然后，有一个for()循环从2011到1900

The loop could look a bit like this :

循环看起来有点像这样：

for ($year=2011 ; $year>=1900 ; $year--) {
    echo '<option value="' . $year . '"';
    if ($year == $birthdayYear) {
        echo 'selected="selected"';
    }
    echo '>' . $year . '</option>' . PHP_EOL;
}

Of course, the 2011year should probably not be hard-coded -- take a look at date()for a possible way of getting the current year.

当然，2011年份可能不应该是硬编码的——看看date()获取当前年份的可能方法。

回答by Brad

for ($x=(int)date("Y"); $x>=1900; $x=$x--) {
    echo "<option value=\"", $x, "\"", ($birthdayYear==$x) ? " selected=\"selected\"" : "", ">", $x, "</option>"
}

This has the added bonus that you don't have to update it every year.

这有一个额外的好处，你不必每年都更新它。

回答by George Cummins

First, output the '0000' option. It does not follow the pattern, so it should not be included in the loop:

首先，输出“0000”选项。它不遵循模式，因此不应包含在循环中：

<option value="0000"<?php echo $birthdayYear == '0000' ? 'selected="selected"' : ''; ?>>Year:</option>

Next, create a loop and output each of the parts of the option. I started with date('Y')(the current year) rather than the hard-coded '2011' so your script will not need to be updated every year.

接下来，创建一个循环并输出选项的每个部分。我从date('Y')（当前年份）而不是硬编码的“2011”开始，因此您的脚本不需要每年更新。

for ( $i = date('Y'); $i >= 1900; $i-- ) {
    echo "<option value=\"$i\"";
    echo $birthdayYear == $i ? 'selected="selected"' : '';
    echo ">$i</option>";
}

The three echo statements could be combined into one. I placed them on separate lines for clarity.

三个 echo 语句可以合二为一。为了清楚起见，我将它们放在不同的行上。

回答by Anthony Simmon

Try this:

尝试这个：

<select name="birthdayYear" >
<?php
if($year == '0000') {
    echo '<option value="0000" selected="selected">0000</option>';
} else {
    echo '<option value="0000">0000</option>';
}
for($year = intval(date('Y')); $year > 1900; $year --) {
    if($year == $birthdayYear) {
        echo '<option value="'.$year.'" selected="selected">'.$year.'</option>';
    } else {
        echo '<option value="'.$year.'">'.$year.'</option>';
    }
}
?>
</select>

回答by PeeHaa

<select name="birthdayYear" >
    <option value="0000"<?php echo $birthdayYear == '0000' ? 'selected="selected"' : ''; ?>>Year:</option>

<?php
for($i=date('Y'); $i>1899; $i--) {
    $selected = '';
    if ($birthdayYear == $i) $selected = ' selected="selected"';
    print('<option value="'.$i.'"'.$selected.'>'.$i.'</option>'."\n");
}
?>

</select>

And, would a loop be more efficient then listing them out one by one?

而且，循环会比一一列出它们更有效吗？

I don't think you have to worry about efficiency. Using a loop just looks cleaner it will be easier to maintain I think.

我认为您不必担心效率。使用循环看起来更干净，我认为维护起来会更容易。

回答by Mr Griever

1900 is at least as arbitrary as 2011. We can make one that only spans 100 years from the current year.

1900 年至少与 2011 年一样随意。我们可以制作一个从当前年份起仅跨越 100 年的时间。

<?php $selectedYear = $_REQUEST['birthdayYear'] ?>
<select id="birthdayYear">
<option value="0">Year:</option>
<?php $currYear = date('Y') ?>
<?php for ($i=0; $i<100; ++$i) : ?>
<?php $displayYear = $currYear-$i ?>
<option value="<?= $displayYear ?>"<?= ($displayYear == $selectedYear ? 'selected="selected"' : '') ?>><?= $displayYear ?></option>
<?php endfor; ?>
</select>

To get back to 1900 exactly, just change the for condition to 112.

要准确返回 1900，只需将 for 条件更改为 112。

回答by tdammers

Loop, please. It's not so much a matter of code efficiency (which, at this level, hardly matters at all), but very much one of developer efficiency: A loop is much easier on the eye, it doesn't force the reader to scroll or fold, and it reduces the potential for a typo to introduce subtle bugs (with a loop, they're either all wrong or all correct).

请循环。这与其说是代码效率的问题（在这个层面上，根本不重要），而是开发人员效率的一个重要问题：循环在视觉上要容易得多，它不会强迫读者滚动或折叠，它减少了打字错误引入细微错误的可能性（对于循环，它们要么全错，要么全正确）。

Honestly, any such dropdown with more than two entries in such a regular pattern makes me twitch and reach for the forkeyword. A hundred of them is bordering on embarrassment.

老实说，任何在这样的规则模式中包含两个以上条目的下拉菜单都会让我抽搐并找到for关键字。一百个都快尴尬了。

回答by zmozmo

<select name="birthday">
<option value="0">-</option>
<?php
    for($i=1990; $i<=2013; $i++) { ?>

<option value="<?php echo $i; ?>">

<?php echo $i; ?>

回答by grep

Personally, I would not loop this. I would place it in a separate PHP file and include it onto your page. This way to does not take up space everywhere it needs to be, and you can easily modify the data from just one file, which will update across your application.

就个人而言，我不会循环这个。我会将它放在一个单独的 PHP 文件中，并将其包含在您的页面中。这种方式不会在任何需要的地方占用空间，而且您可以轻松地从一个文件中修改数据，该文件将在您的应用程序中更新。