"PHP Classes and objects" traversal

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Traversing objects

PHP 5 provides a way to define objects so that they can traverse through a list of cells

By default, all visible properties are used for traversal.

Example #1 Simple Object Traversal (a foreach traversal of all the visible properties it can access.) ) <?phpclass myclass{public    $var 1 = ' value 1 ';    Public $var 2 = ' value 2 ';    Public $var 3 = ' value 3 ';        Protected $protected = ' protected var ';    Private   $private   = ' private var ';    function iteratevisible () {       echo "myclass::iteratevisible:\n";       foreach ($this as $key + $value) {           print "$key = = $value \ n";}}    $class = new MyClass (), foreach ($class as $key = = $value) {    print "$key = + $value \ n";} echo "\ n"; $class->iteratevisible ();? >

Implements the Iterator interface (pre-defined interface). You can let the object decide for itself how to traverse and which values are available each time.

 #接口摘要 #iterator extends traversable {Abstract public mixed current (void)// Returns the element that the current index cursor points to abstract public scalar key (void)//Returns the key that the current index cursor points to, abstract public void next (void)//move Current index Tour   Mark to next element abstract public void rewind (void)//Reset index cursor Abstract public boolean valid (void)//Determine whether the element pointed to by the current index cursor is valid These methods are automatically called when an object that implements the iterator interface is traversed by a foreach. The invocation is in the following sequence: Rewind (), valid (), current (), key (), Next () 

example #2 implements object traversal of Iterator interface <?phpclass Myiterator implements iterator{private $var = arr    Ay ();        Public function __construct ($array) {if (Is_array ($array)) {$this->var = $array;        }} Public Function rewind () {echo "rewinding\n";    Reset ($this->var);        The public Function current () {$var = current ($this->var);        echo "Current: $var \ n";    return $var;        Public Function key () {$var = key ($this->var);        echo "key: $var \ n";    return $var;        Public function Next () {$var = next ($this->var);        echo "Next: $var \ n";    return $var;        Public Function Valid () {$var = $this->current ()!== false;        echo "valid: {$var}\n";    return $var; }} $values = array, $it = new Myiterator ($values), foreach ($it as $a + = $b) {print "$a: $b \ n";}?