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Read and write data to textfile

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I created this code for practice, and I looking for better and clear solution for the last instance where I can write or delete the data, but after I want to get back the content as array or the key as string. I want to use this write-read back with only one instance.

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  1. // The input is a textfile:
  2. // key1=val1
  3. // key2=val2
  4. // key3=val3
  5. // key4=val4
  6. //     .
  7. //     .
  8. //     .
  9.  
  10. // The class:
  11.  
  12.   class UserID {
  13.     private $UIDPath;
  14.     private $UserUIDcontent;
  15.  
  16.     public function __construct($UserID, $Action, $UID_KEY, $UID_VAL, $Back) {
  17.       $UID_Content = $this -> UIDPath = 'the/path/to/input/text.txt';
  18.       $UserUIDcontent = array();
  19.  
  20.       if (file_exists($UID_Content) && (is_file($UID_Content))) {
  21.         foreach (file($UID_Content) as $UIDlines) {
  22.           list($key, $value) = explode('=', $UIDlines, 2) + array(NULL, NULL);
  23.           if (trim($value) !== NULL) { $UserUIDcontent[$key] = trim($value); }
  24.         }
  25.  
  26.         if ($Action == 'Read') {
  27.           if ($UID_KEY == NULL) {
  28.             $this -> UserUIDcontent = $UserUIDcontent;
  29.           } else {
  30.             if (array_key_exists($UID_KEY, $UserUIDcontent)) {
  31.               $this -> UserUIDcontent = $UserUIDcontent[$UID_KEY];
  32.             } else {
  33.               if ($UID_KEY == 'User') {
  34.                 return NULL;
  35.               } else {
  36.                 unset($UserUIDcontent[$UID_KEY]);
  37.                 echo 'ERROR: The search key: ' . $UID_KEY . ' not available in Class: ' . __METHOD__;
  38.                 return;
  39.               }
  40.             }
  41.           }
  42.         } elseif ($Action == 'Write') {
  43.           if (is_array($UID_KEY)) {
  44.             if (count($UID_KEY) == count($UID_VAL)) {
  45.               $UserUIDcontent = array_filter(array_merge($UserUIDcontent, array_combine($UID_KEY, $UID_VAL)));
  46.             } else {
  47.               echo 'ERROR: Keys: ' . count($UID_KEY) . ' and Values: ' . count($UID_VAL) . ' are not equal in Class: ' . __METHOD__;
  48.               return;
  49.             }
  50.           } else {
  51.             $UserUIDcontent[$UID_KEY] = $UID_VAL;
  52.           }
  53.           foreach ($UserUIDcontent as $key => $value) {
  54.             if ($value !== NULL) {
  55.               $UIDcontentTXT .= trim($key) . '=' . trim($value) . PHP_EOL;
  56.             }
  57.           }
  58.           trim($UIDcontentTXT);
  59.           $handle = fopen($UID_Content, "w");
  60.           fwrite($handle, $UIDcontentTXT, strlen($UIDcontentTXT));
  61.           fclose($handle);
  62.  
  63.           if ($Back != NULL) {
  64.             if (array_key_exists($Back, $UserUIDcontent)) {
  65.               return $this -> $UserUIDcontent = $UserUIDcontent[$Back];
  66.             } else {
  67.               return $this -> $UserUIDcontent = $UserUIDcontent;
  68.             }
  69.           } else {
  70.             return $this -> $UserUIDcontent = NULL;
  71.           }
  72.         } else {
  73.           echo 'ERROR: The second parameter ' . $Action . ' not allowed in Class: ' . __METHOD__;
  74.           return;
  75.         }
  76.       } else {
  77.         echo 'ERROR: Required data source not found for Class: ' . __METHOD__;
  78.         return;
  79.       }
  80.     }
  81.  
  82.     public function result() {
  83.       return $this -> UserUIDcontent;
  84.     }
  85.   }
  86.  
  87. // ---------------------------------
  88. // instances:
  89. // ---------------------------------
  90.  
  91. $UserData = new UserID($UserID, 'Read', NULL, NULL, NULL);
  92. $array = $UserData -> result(); // Read full array
  93. $val = $UserData -> result()[key2]; // Read one data
  94.  
  95. $UserData = new UserID($UserID, 'Read', 'key2', NULL, NULL);
  96. $val = $UserData -> result(); // Read one data
  97.  
  98. $UserData = new UserID($UserID, 'Write', array('key2', 'aaaaaaaaa', 'User'), array(NULL, 'bbbbbbbb', NULL), NULL);
  99. $UserData; // write or delete more than one data by array
  100.  
  101. $UserData = new UserID($UserID, 'Write', 'key2', NULL, NULL);
  102. $UserData; // write or delete one data
  103.  
  104. // this is the problem:
  105. $UserData = new UserID($UserID, 'Write', array('User', 'key2', 'key3', 'key15'), array('aaaa', NULL, 'aaa', 'value15'), 1);
  106. $array = $UserData -> Array; // Write AND Read back full array or one key

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