October 24 Morning PHP Object-oriented

Defining Arrays$attr=Array();$attr[0] = 1; indexed array$attr=Array(1,2,3,4); associative arrays$attr=Array("Code" = "P001", "name" = "Zhang San"); two-dimensional arrays$attr=Array(Array(),Array()); array traversal for loop traversal for($i= 0;$i<Count($attr);$i++)Count（$attr) array length, only applicable to index traversal {$attr[$i];} The best use of foreach traversalforeach($attr  as $vall values are given to v{$v;}foreach($attr  as $k=$v)Keygive the K value a v{ .$k;$v;}$attr=Array(1,2,3,4,5,2);foreach($attr  as $k=$v) {if($v==3) {unset($attr[$k]); Delete Element}}$attr=array_values($attr); Re-indexVar_dump($attr);  each() and list () method traversalVar_dump( each($attr)); Remove the element that the current pointer points toList($a,$b)=$attr;Echo $b; pointer traversalEcho  Current($attr);Echo Key($attr);Next($attr);prev($attr);End($attr);Reset($attr);Var_dump(In_array(9,$attr)); Determine whether a value exists in an arrayVar_dump(Array_reverse($attr)); Flipping an arrayVar_dump(Array_unique($attr)); Go heavy$attr 1=Array(9,10);Var_dump(Array_merge($attr,$attr 1)); Merging ArraysArray_push($attr, 10); add element to array, return value is not a new arrayVar_dump($attr);$attr[]=11; Add elements to an arrayVar_dump($attr); object -oriented process-oriented$a= 10;$b= 15;Echo $a+$b; object-oriented1.What's called an object, everything is an object .2.what is called a class is made by the abstraction of many objectsclassren{describing human characteristic member variables by variables and methods Public $name; Public $sex; Construction Methodfunction__construct ($n){$sex=$n; Error$this Keywords,represents the object inside a class$this->sex =$nThe correct} member method generally requires access to the default public everywhere Public functionSpeak () {Echo"Talking Now";}}$r=NewRen ("Male"); Instantiating an objectVar_dump($r);$r 1=NewRen ("female");Var_dump($r 1); Construction method, always exists, if not write also existsVar_dump($r);$r->name = "John Doe"; Assign a valueEcho $r-Name: ValueVar_dump($r);$r-Speak ();$r 1=NewRen (); Instantiating an object$r 1->name = "Data";Var_dump($r==$r 1); access modifiers Public: On behalf of the public, accessible anywhereprotected: Represents a protected, accessible only in the class or subclass of the classPrivate: Represents a private, accessible only in this class

October 24 Morning PHP Object-oriented