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  1. <?php
  2.  
  3. class mysqli2 
  4. {
  5. 	public function query($query)
  6. 	{
  7. 		return 'mysqli-query: ' . $query;
  8. 	}
  9. }
  10.  
  11. interface iDatabase
  12. {
  13.    static public function execute($query);
  14.    public function instantiatedExecute($query);
  15. }
  16.  
  17. abstract class database implements iDatabase
  18. {
  19.     protected static $conn;
  20.  
  21.     public static $connections = 0;
  22.  
  23.     public static $objects = 0;
  24.  
  25.     /**
  26.      * create an instance of database that uses the same connection across all instances
  27.      */
  28.     final public function __construct()
  29.     {
  30.     	self::$objects++;
  31.         self::connect();
  32.     }
  33.  
  34.     /**
  35.      * Connect to a database if not already connected
  36.      */
  37.     final protected static function connect()
  38.     {
  39.         if (null === self::$conn || false === (self::$conn instanceof mysqli2)) {
  40.         	echo 'Connecting to database' . PHP_EOL;
  41.         	self::$connections++;
  42.             self::$conn = new mysqli2( /* DB info */ );
  43.             //add error checking here...
  44.         }
  45.         return self::$conn;
  46.     }
  47.  
  48.    /**
  49.     * query database connection using static method
  50.     */
  51.    final public function query($query)
  52.    {
  53.        return self::doQuery($query);
  54.    }
  55.  
  56.    /**
  57.     * static query database connection
  58.     */
  59.    final public static function doQuery($query)
  60.    {
  61.       //sanitize query here if desired
  62.       return self::connect()->query($query);
  63.    }
  64.  
  65. }
  66.  
  67. class example extends database
  68. {
  69.  
  70.     /**
  71.      * example specific static execution
  72.      */
  73.     public static function execute($query)
  74.     {
  75.         return self::doQuery($query . ' Static');
  76.     }
  77.  
  78.     /**
  79.      * example specific non-static execution
  80.      */
  81.     public function instantiatedExecute($query)
  82.     {
  83.        return $this->query($query . ' Instantiated');
  84.     }
  85. }
  86.  
  87.  $database = new example;
  88.  $database2 = new example;
  89.  $res = array(
  90. 	 $database->instantiatedExecute('foo'),
  91. 	 $database::execute('bar'),
  92. 	 Example::execute('baz'),
  93. 	 Example::execute('FOO'),
  94. 	 $database2::execute('BAR'),
  95. 	 $database2->instantiatedExecute('BAZ'),
  96.  );
  97.  
  98. echo implode(PHP_EOL, $res) . PHP_EOL;
  99. echo database::$objects . ' total objects instantiated' . PHP_EOL;
  100. echo Example::$connections . ' total connections' . PHP_EOL;
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin
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Standard input is empty
stdout
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Connecting to database
mysqli-query: foo Instantiated
mysqli-query: bar Static
mysqli-query: baz Static
mysqli-query: FOO Static
mysqli-query: BAR Static
mysqli-query: BAZ Instantiated
2 total objects instantiated
1 total connections
https://ideone.com/6qxvqx
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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