现在正坐在安静的寝室里,寒假俨然已经离我而去了……今天发的是我寒假里搞的最后一次学习,之后的时间就一直在看海贼王了。
以前写过一个C语言的遍历目录+复制文件的程序,很长很复杂,现在用PHP一样可以实现遍历目录,而代码就短了不少。这个程序目的是遍历目录,找到所有指定文件名的文件,并删除其中指定的字符串。
代码如下:
//功能:删除指定目录(包括子目录)下所有指定文件中指定字符串
$tmpfiledir = $_SERVER["DOCUMENT_ROOT"].'tmp.txt';
function del($getstr)
{
$isbak = true; //是否备份原文件,true为备份,false不备份
global $tmpfiledir;
$fr = fopen($tmpfiledir,"r") or die('未能打开临时文件');
while($row = fgets($fr))
{
if(empty($row)) break;
$row = trim($row);
$opp = fopen($row,"r") or die("未能打开$row");
$str = fread($opp,filesize($row)) or die("不能读$row");
$str = str_replace($getstr,"",$str);
fclose($opp);
if($isbak){
copy($row,$row.'.bak') or die("备份文件失败");
}
$ref = fopen($row,"w") or die("重新打开文件失败");
fwrite($ref,$str) or die("重新写入文件失败");
}
}
function traverse($path) {
global $name,$tmpfiledir;
$current_dir = opendir($path); //opendir()返回一个目录句柄,失败返回false
if($current_dir == false)
return false;
while(($file = readdir($current_dir)) !== false) { //readdir()返回打开目录句柄中的一个条目
$sub_dir = $path . DIRECTORY_SEPARATOR . $file; //构建子目录路径
if($file == '.' || $file == '..') {
continue;
} else if(is_dir($sub_dir)) { //如果是目录,进行递归
traverse($sub_dir);
} else { //如果是文件,再做比较
$fileinfo = pathinfo($sub_dir);
if($fileinfo['basename'] == $name)
{
$fopen = fopen($tmpfiledir,"a");
fwrite($fopen,$sub_dir."\r\n");
fclose($fopen);
}
}
}
return true;
}
if(isset($_POST["name"]) && isset($_POST["dir"]) && isset($_POST["str"]))
{
$name = $_POST["name"];
traverse($_POST["dir"]) or die("未能创建临时文件,请检查网站根目录是否可写");
del($_POST["str"]);
echo "成功";
unlink($tmpfiledir);
}
else
{
echo "
输入相关信息
";}
?>
你们可以看到我写了两个函数,函数traverse将查找到的指定文件路径写在一个临时文件里,函数del删除这些文件里的指定字符串。其实我也觉得很鸡肋,直接在遍历的时候删除就可以了,根本不用生成什么临时文件。
其实我一开始是用C语言写好的遍历,因为C语言不好对文件操作所以才用php写删除的部分,所以一开始只写了一个del函数,后来干脆把遍历文件也用php写了(似乎比C简单的多),所以又写了一个函数traverse。大家只管看遍历的部分就成,也可以和我之前用C写的遍历的代码对比(我发了源代码的),看看有什么不同。
不过这个版本不支持通配符,所以文件名必须要指定。作用嘛(也是我写这个的理由),可以批量删除我们挂在服务器上的一句话木马。

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

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PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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