PHP는 파일 내용을 읽습니다: 데이터 가져오기 및 구문 분석을 구현하는 단계

<form method="post" enctype="multipart/form-data">
   <input type="file" name="fileToUpload" id="fileToUpload">
   <input type="submit" value="上传文件" name="submit">
</form>

$target_dir = "uploads/";  // 指定上传文件的保存目录
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);  // 获取上传文件的路径
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));  // 获取上传文件的扩展名

// 检查上传文件是否是图片
if(isset($_POST["submit"])) {
   $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
   if($check !== false) {
      echo "文件是一个图片 - " . $check["mime"] . ".";
      $uploadOk = 1;
   } else {
      echo "文件不是一个图片.";
      $uploadOk = 0;
   }
}

// 检查文件是否已存在
if (file_exists($target_file)) {
   echo "文件已存在.";
   $uploadOk = 0;
}

// 检查文件大小
if ($_FILES["fileToUpload"]["size"] > 500000) {
   echo "文件太大.";
   $uploadOk = 0;
}

// 允许特定的文件格式上传
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif" ) {
   echo "只允许上传jpg, jpeg, png, gif格式的文件.";
   $uploadOk = 0;
}

// 检查$uploadOk变量值是否发生变化，若为0则不允许上传文件
if ($uploadOk == 0) {
   echo "文件未上传.";
// 若$uploadOk变量值为1，将文件移动到指定目录
} else {
   if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
      echo "文件" . basename($_FILES["fileToUpload"]["name"]) . "上传成功.";
   } else {
      echo "文件上传失败.";
   }
}

$filename = "example.txt";
$file = fopen($filename, "r");
if ($file) {
   while (($line = fgets($file)) !== false) {
      echo $line;
   }
   fclose($file);
}

$filename = "example.csv";
if (($handle = fopen($filename, "r")) !== false) {
   while (($data = fgetcsv($handle, 1000, ",")) !== false) {
      $num = count($data);
      for ($c = 0; $c < $num; $c++) {
         echo $data[$c] . "<br>";
      }
   }
   fclose($handle);
}

$filename = "example.json";
$data = file_get_contents($filename);
$json = json_decode($data, true);
foreach($json as $item) {
   echo $item['name'] . "<br>";
   echo $item['age'] . "<br>";
}

$filename = "example.xml";
$xml = simplexml_load_file($filename);
foreach($xml->children() as $element) {
   echo $element->getName() . ": " . $element . "<br>";
}