php数组的逐行写入文件与读取

 <?php

 /**
  *
  * 对数组$arr1=['Apple Orange Banana Strawberry'] 写入文件，并读取
  **/
 class IoFile
 {
     private $path;

     public function __construct($paths)
     {
         $this->path = $paths;
     }

 //写入
     public function inter($arr)
     {
         if (!is_array($arr) && !empty($arr)) {
             return '数组异常';
         }

         $file = fopen($this->path, 'w');
         if (!$file) {
             return '文件打开失败';
         }
         foreach ($arr as $k => $v) {
             fwrite($file, $v);
             if ($v != end($arr)) {
                 fwrite($file, "\r\n");
             }
         }
         fclose($file);
     }

 //读取
     public function outer()
     {
         $arr = [];
         if (!file_exists($this->path)) {
             return "文件不存在！";
         }
         $file = fopen($this->path, 'r');
         if (!$file) {
             return '文件打开失败';
         }
         while (!feof($file)) {
             $arr[] = str_replace("\r\n", '', fgets($file));
         }
         fclose($file);
         return $arr;
     }
 }

 $arr1 = ['Apple', 'Orange', 'Banana', 'Strawberry'];
 $path = 'tt.txt';
 $obj = new IoFile($path);
 echo $obj->inter($arr1);

 echo '<hr/>';
 var_dump($obj->outer());