每次在PHP

Question

我有一个上传按钮，当用户点击上传按钮时，用户选择的文件会上传到特定目录。上传按钮调用upload.php文件。
我有一个页面，对于一个问题，在创建测验时可以填写最多5个选项答案，并为每个输入的选项上传音频音轨。

页面快照

upload.php的

<?php
$count=0;

$count++;

$target_dir = "Uploads/Question".$count."/Options/";
$target_file = "Uploads/Question".$count."/Options/".$count.".mp3"; //renames file as 1, 2, 3 etc.
$uploadOk = 1;
$audioFileType = pathinfo($target_file,PATHINFO_EXTENSION);

// Check if file already exists
if (file_exists($target_file)) {
    echo "<br/>Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 50000000) {
    echo "<br/>Sorry, your file is too large.";
    $uploadOk = 0;
}

//Allow certain file formats
if($audioFileType != "avi" && $audioFileType != "mp3" && $audioFileType != "mp4"
&& $audioFileType != "wma" ) {
    echo "<br/>Only AVI, mp3, mp4 & WMA files are allowed.";
    $uploadOk = 0;
}

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "<br/>Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "<br/>Sorry, there was an error uploading your file.";
    }
}
?>

这部分代码$target_file = "Uploads/Question".$count."/Options/".$count.".mp3";应该将文件保存为1.mp3，我希望每次将1增加为1,2,3等。如您所见，在文件本身的开头将计数设置为0。 我的问题是，每次调用upload.php文件时如何增加计数？

有点长，因为很难解释。感谢您的帮助。

Answer 1

增加计数的一种简单方法是计算该目录中已存在的文件数。

更新了upload.php

<?php
$count=0;

$count++;


$i = 1; 
$dir = "Uploads/Question".$count."/Options/"; //count files in that directory
if ($handle = opendir($dir)) {
    while (($file = readdir($handle)) !== false){
        if (!in_array($file, array('.', '..')) && !is_dir($dir.$file)) 
            $i++;
    }
}

$target_dir = "Uploads/Question".$count."/Options/";
$target_file = "Uploads/Question".$count."/Options/".$i.".mp3"; //renames file as 1, 2, 3 etc.
$uploadOk = 1;
$audioFileType = pathinfo($target_file,PATHINFO_EXTENSION);

// Check if file already exists
if (file_exists($target_file)) {
    echo "<br/>Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 50000000) {
    echo "<br/>Sorry, your file is too large.";
    $uploadOk = 0;
}

//Allow certain file formats
if($audioFileType != "avi" && $audioFileType != "mp3" && $audioFileType != "mp4"
&& $audioFileType != "wma" ) {
    echo "<br/>Only AVI, mp3, mp4 & WMA files are allowed.";
    $uploadOk = 0;
}

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "<br/>Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "<br/>Sorry, there was an error uploading your file.";
    }
}
?>

文件夹：