Use iterator,arrayaccess and countable in 24php

iterators are often used by us to facilitate data management when reading large amounts of data in a database.

 
  fruits[$this->position];    }    Returns the current key public    function key () {        return $this->position    }    //Move down one element public    function next () {        + + $this->position;    }        Move to the first element of public    function rewind () {        $this->position = 0;    }    Determine if there is a subsequent element public    function valid () {        return isset ($this->fruits[$this->position+1]);}    }

Enables data in an object to be accessed like an array

 container = Array ("One" = 1, "One" = 2, "three" = 3); }//Assign Public function Offsetset ($offset, $value) {if (Is_null ($offset)) {$this->container        [] = $value;        } else {$this->container[$offset] = $value;    }}//A key exists public function offsetexists ($offset) {return isset ($this->container[$offset]);    }//Delete key value public function Offsetunset ($offset) {unset ($this->container[$offset]); }//Gets the value corresponding to the public function Offsetget ($offset) {return isset ($this->container[$offset])? $this->cont    ainer[$offset]:null; }} $obj = new obj (), Var_dump (Isset ($obj ["" "]), Var_dump ($obj [" ""]), unset ($obj ["]"), Var_dump (Isset ($obj [" "]), $obj [' both '] =" A value "; Var_dump ($obj [' both ']); Echo $obj [' both ']; $obj [] = ' Append 1 '; $obj [] = ' Append 2 '; $obj [] = ' AppE nd 3 '; var_dump ($obj);

Enables an object to count properties

 
  fruits);}    } $basket = new Basket (); Echo count ($basket);

The above describes the use of iterator,arrayaccess and countable in the 24php, including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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