note 99007 added to language.oop5.decon

Another way to emulate multiple constructors: <?php class MyClass { // use a unique id for each derived constructor, // and use a null reference to an array, // for optional parameters function __construct($id="", $args=null) { // parent constructor called first ALWAYS parent::__construct(); echo "main constructor\n"; // avoid null or other types $id = (string) $id; // allow default constructor if ($id == "") { $id = "default"; } // just in case, use lowercase id $id = "__cons_" . strtolower($id); $rc = new ReflectionClass("MyClass"); if (!$rc->hasMethod($id) { echo "constructor $id not defined\n"; } else { // using "method references" $this->$id($args); } $rc = null; } // function __construct // ALWAYS HAVE A default constructor, // that ignores arguments function __cons_default($args=null) { echo "Default constructor\n"; } // may have other constructors that expect different // argument types or argument count function __cons_min($args=null) { if (! is_array($args) || count($args) != 2) { echo "Error: Not enough parameters (Constructor min(int $a, int $b)) !!!\n"; } else { $a = (int) $args[0]; $b = (int) $args[1]; $c = min($a,$b); echo "Constructor min(): Result = $c\n"; } } // may use string index (associative array), // instead of integer index (standard array) function __cons_fullname($args=null) { if (! is_array($args) || count($args) < 2) { echo "Error: Not enough parameters (Constructor fullname(string $firstname, string $lastname)) !!!\n"; } else { $a = (string) $args["firstname"]; $b = (string) $args["lastname"]; $c = $a . " " . $b; echo "Constructor fullname(): Result = $c\n"; } } } // class // --> these two lines are the equivalent $obj1 = new TestClass(); $obj2 = new TestClass("default"); // --> these two are specialized // should be read as "$obj3 = new TestClass, min(99.7, 99.83);" $obj3 = new TestClass("min", array(99.7, 99.83)); // should be read as "$obj4 = new TestClass, fullname("John", "Doe");" $obj4 = new TestClass("fullname", array("firstname" => "John", "lastname" => "Doe")); // --> these two lack parameters $obj5 = new TestClass("min", array()); $obj6 = new TestClass("fullname"); ?> ---- Server IP: 69.147.83.197 Probable Submitter: 189.156.192.49 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.decon.php Edit -- https://master.php.net/note/edit/99007 Del: integrated -- https://master.php.net/note/delete/99007/integrated Del: useless -- https://master.php.net/note/delete/99007/useless Del: bad code -- https://master.php.net/note/delete/99007/bad+code Del: spam -- https://master.php.net/note/delete/99007/spam Del: non-english -- https://master.php.net/note/delete/99007/non-english Del: in docs -- https://master.php.net/note/delete/99007/in+docs Del: other reasons-- https://master.php.net/note/delete/99007 Reject -- https://master.php.net/note/reject/99007 Search -- https://master.php.net/manage/user-notes.php