PHP文件类型限制 [英] PHP File Type Restrictions

问题描述

我正在尝试PHP我的第一个实际脚本，其中大部分来自教程:( 无论如何

I am trying out PHP my first actual script, most of it from tutorial :( Anyway's

我在这方面有问题

// This is our limit file type condition
if (!($uploaded_type=="text/java")||!($uploaded_type=="file/class")||!($uploaded_type=="file/jar")) {
echo "You may only upload Java files.<br>";

$ok=0;
}

基本上，它不允许任何文件，即使那里的文件也不允许 帮助！ 我只希望Java文件被允许！

Basically it doesn't allow any files, even those up there help! I want the Java files to be allowed only!

这是完整的代码

<?php
$target = "upload/";
$target = $target . basename( $_FILES['uploaded']['name']) ;
$uploaded = basename( $_FILES['uploaded']['name']) ;
$ok=1;

//This is our size condition
if ($uploaded_size > 350000) {
    echo "Your file is too large.<br>";
    $ok=0;
}

// This is our limit file type condition
if (!($uploaded_type=="text/java")||!($uploaded_type=="file/class")||! ($uploaded_type=="file/jar")) {
    echo "You may only upload Java files.<br>";
    $ok=0;
}

echo $ok;  //Here we check that $ok was not set to 0 by an error
if ($ok==0) {
    echo "Sorry your file was not uploaded";
}else {
    if(move_uploaded_file($_FILES['uploaded']['tmp_name'], $target)) {
        echo "The file ". $uploaded ." has been uploaded";
    } else {
        echo "Sorry, there was a problem uploading your file.";
    }
}
?>

推荐答案

您正在使用OR ...，这意味着如果其成员参数的 ANY 为true，则整个语句的值为TRUE.由于文件只能是一种类型，因此您要排除所有文件.您想要的是与"匹配项:

You're using an OR... that means the whole statement evaluates as TRUE if ANY of its member arguments are true. Since a file can only be of one type, you're excluding ALL files. What you want is an 'and' match:

if (!($uploaded_type == 'text/java') && !($uploaded_type == ....)) {
                                     ^^---boolean and

假设我们正在处理文件/类文件类型，则您的版本为:

Pretending that we're working with a file/class file type, then you version reads:

if the (file is not text/java) OR the (file is not file/class) OR the (file is not file/jar)
              TRUE                           FALSE                          TRUE

TRUE or FALSE or TRUE -> TRUE

切换到AND即可

TRUE and FALSE and TRUE -> FALSE

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