PHP arrayaccess Array Access interface in pre-defined interface

<?phpclass obj implements arrayaccess {private $container = array (); Public Function __construct () {$this-container = Array ("One" = 1, "    "= 2," three "= 3,);        The Public Function Offsetset ($offset, $value) {echo ' executes the object when the array is assigned the same value, this method ';        if (Is_null ($offset)) {$this, container [] = $value;        } else {$this-container [$offset] = $value;                The Public Function offsetexists ($offset) {echo ' executes the object when it is defined as an array, this method ';    Return Isset ($this-Container [$offset]);        The Public Function Offsetunset ($offset) {echo ' executes when an object is deleted as an array, this method ';    unset ($this-Container [$offset]);        The Public Function Offsetget ($offset) {echo ' takes an object as an array to fetch an element when executed, this method '; return Isset ($this COntainer [$offset])?    $this-Container [$offset]: null; }} $obj = new obj; Var_dump (isset ($obj ["")]) var_dump ($obj ["" "]) unset ($obj ["] ") Var_dump (Isset ( $obj ["n"])), $obj ["" ""] = "a value"; Var_dump ($obj ["" "]); $obj [' A '] = ' Append 1 '; $obj [' b '] = ' Append 2 '; $obj [' c '] = ' Append 3 ';p rint_r ($obj);

PHP arrayaccess Array Access interface in pre-defined interface