重复 PHP readdir 代码

Question

也许这是一个愚蠢的问题，但我自己无法解决。

我有以下代码：

<?php
    $path = "galeria01";
    $dir_handle = @opendir($path) or die("Not found: $path");
    list_dir($dir_handle,$path);

    function list_dir($dir_handle,$path)
    {
        global $div;
        $div = 001;
        global $zindex;
        $zindex = 200;
        global $margem;
        $margem = 114;
        while ((($file = readdir($dir_handle)) !== false)) {
            if ($file != "." && $file != ".." ) {
                echo PHP_EOL . '<div id="';
                echo str_pad($div, 3, 0, STR_PAD_LEFT);
                echo '" style="position:absolute;left:';
                echo $margem;
                echo 'px;z-index:';
                echo $zindex;
                echo '"><img src="galeria01/';
                echo $file;
                echo '" width="675" height="450" /></div>';
                echo'<span class="clear"></span>';
                $div++;
                $zindex--;
                $margem = $margem - 675;
            }
        }
    }
    closedir($dir_handle);
?>

如您所见，它读取文件夹中的所有文件，并生成以下代码：

<div id="001" style="position:absolute;left:114px;z-index:200"><img src="001.jpg" width="675" height="450" /></div><span class="clear"></span>
<div id="002" style="position:absolute;left:-561px;z-index:199"><img src="002.jpg" width="675" height="450" /></div><span class="clear"></span>
<div id="003" style="position:absolute;left:-1236px;z-index:198"><img src="003.jpg" width="675" height="450" /></div><span class="clear"></span>
<div id="004" style="position:absolute;left:-1911px;z-index:197"><img src="004.jpg" width="675" height="450" /></div><span class="clear"></span></div>

我只需要重新运行代码几次并再次以相同的顺序生成所有这些动态生成的 div ，但总是减少左边距和 z-index 值，如下所示：

    <div id="001" style="position:absolute;left:114px;z-index:200"><img src="001.jpg" width="675" height="450" /></div><span class="clear"></span>
                     (...)
    <div id="004" style="position:absolute;left:-1911px;z-index:197"><img src="004.jpg" width="675" height="450" /></div><span class="clear"></span></div>
    <div id="001" style="position:absolute;left:-2586px;z-index:196"><img src="001.jpg" width="675" height="450" /></div><span class="clear"></span>
                     (...)

我该怎么做？

我希望这很简单，并且您能帮助我。

谢谢。

Answer 1

要重新运行代码，您始终可以再次执行代码。

除此之外，您需要将当前的全局变量初始化从函数内移动到全局范围，以允许在代码的额外重新运行时修改它们。

这是您修改后的代码以及一些注释：

<?php
$path = ".";
$dir_handle = @opendir($path) or die("Not found: $path");

// do the init of these variables outside of the function and before the first call
global $zindex;
$zindex = 200;
global $margem;
$margem = 114;

// now call your function, it will behave like your original code
list_dir($dir_handle,$path);

// now call the your function again, it will pick up with the zindex/margem values of the last div you printed
list_dir($dir_handle,$path);

function list_dir($dir_handle,$path)
{
    global $div;
    $div = 001;
    global $zindex;
    // no longer set a new value for the zindex with each function call
    //$zindex = 200;
    global $margem;
    // no longer set a new value for the margem with each function call
    //$margem = 114;
    //reset the directory handle to the first position
    rewinddir($dir_handle);
    while ((($file = readdir($dir_handle)) !== false)) {
        if ($file != "." && $file != ".." ) {
            echo PHP_EOL . '<div id="';
            echo str_pad($div, 3, 0, STR_PAD_LEFT);
            echo '" style="position:absolute;left:';
            echo $margem;
            echo 'px;z-index:';
            echo $zindex;
            echo '"><img src="galeria01/';
            echo $file;
            echo '" width="675" height="450" /></div>';
            echo'<span class="clear"></span>';
            $div++;
            $zindex--;
            $margem = $margem - 675;
        }
    }
}
closedir($dir_handle);
?>