PHP advanced programming (5/5) _ PHP Tutorial

PHP advanced programming (55 ). ArrayAccess interface the ArrayAccess interface is an array of objects and defines four methods. Interface Overview: ArrayAccess {* Methods * abstractpublicbooleanoffse ArrayAccess interface

The ArrayAccess interface is an array of objects and defines four methods. The interface is as follows:

ArrayAccess {/* Methods */abstract public boolean offsetExists ( mixed $offset )abstract public mixed offsetGet ( mixed $offset )abstract public void offsetSet ( mixed $offset , mixed $value )abstract public void offsetUnset ( mixed $offset )}

The ArrayAccess interface does not provide the function of calculating the number of duplicate elements in a book group. to calculate the number, you can implement the Countble interface. This interface contains a count () method and returns the number of elements.

 _arr = array();    }    public function offsetSet($offset, $value)    {        $this->_arr[$offset] = $value;    }    public function offsetGet($offset)    {        return $this->_arr[$offset];    }    public function offsetExists($offset)    {        return array_key_exists($offset, $this->_arr);    }    public function offsetUnset($offset)    {        unset($this->_arr[$offset]);    }}$MyArray = new MyArray();$MyArray['first'] = 'test';echo $MyArray['first'];unset($MyArray['first']);?>

ArratObject class Introduction

The ArrayObject class is an implementation class of the ArrayAccess interface. It provides iteration functions and many useful methods for sorting and processing data.

ArrayObject implements IteratorAggregate , ArrayAccess , Serializable , Countable {/* Constants */const integer STD_PROP_LIST = 1 ;const integer ARRAY_AS_PROPS = 2 ;/* Methods */public __construct ([ mixed $input = [] [, int $flags = 0 [, string $iterator_class = "ArrayIterator" ]]] )public void append ( mixed $value )public void asort ( void )public int count ( void )public array exchangeArray ( mixed $input )public array getArrayCopy ( void )public int getFlags ( void )public ArrayIterator getIterator ( void )public string getIteratorClass ( void )public void ksort ( void )public void natcasesort ( void )public void natsort ( void )public bool offsetExists ( mixed $index )public mixed offsetGet ( mixed $index )public void offsetSet ( mixed $index , mixed $newval )public void offsetUnset ( mixed $index )public string serialize ( void )public void setFlags ( int $flags )public void setIteratorClass ( string $iterator_class )public void uasort ( callable $cmp_function )public void uksort ( callable $cmp_function )public void unserialize ( string $serialized )}

The ArrayAccess interface is an array of objects and defines four methods. Interface Overview: ArrayAccess {/* Methods */abstract public boolean offse...