ArrayAccess (interface)
ArrayAccess接口
介绍
(PHP 5 >= 5.0.0, PHP 7)
提供数组访问对象的接口。
界面简介
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 )
}
示例＃1基本用法
<?php
class obj implements ArrayAccess {
private $container = array(
public function __construct() {
$this->container = array(
"one" => 1,
"two" => 2,
"three" => 3,
}
public function offsetSet($offset, $value) {
if (is_null($offset)) {
$this->container[] = $value;
} else {
$this->container[$offset] = $value;
}
}
public function offsetExists($offset) {
return isset($this->container[$offset]
}
public function offsetUnset($offset) {
unset($this->container[$offset]
}
public function offsetGet($offset) {
return isset($this->container[$offset]) ? $this->container[$offset] : null;
}
}
$obj = new obj;
var_dump(isset($obj["two"])
var_dump($obj["two"]
unset($obj["two"]
var_dump(isset($obj["two"])
$obj["two"] = "A value";
var_dump($obj["two"]
$obj[] = 'Append 1';
$obj[] = 'Append 2';
$obj[] = 'Append 3';
print_r($obj
?>
上面的例子会输出类似于：
bool(true)
int(2)
bool(false)
string(7) "A value"
obj Object
(
[container:obj:private] => Array
(
[one] => 1
[three] => 3
[two] => A value
[0] => Append 1
[1] => Append 2
[2] => Append 3
)
)
目录
- ArrayAccess::offsetExists - 是否存在偏移量
- ArrayAccess::offsetGet - 要检索的偏移量
- ArrayAccess::offsetSet - 为指定的偏移量分配一个值
- ArrayAccess::offsetUnset - 取消偏移量
← Throwable::__toString
ArrayAccess::offsetExists →
