ArrayAccess
— interface to provide accessing to objects as arrays 提供以數(shù)組形式訪問對(duì)象的接口。
interface synopsis 接口需要實(shí)現(xiàn)下面幾個(gè)方法
interface ArrayAccess {
/* Methods */
public offsetExists(mixed $offset): bool
public offsetGet(mixed $offset): mixed
public offsetSet(mixed $offset, mixed $value): void
public offsetUnset(mixed $offset): void
}
basic usage 基礎(chǔ)用法 實(shí)現(xiàn)訪問數(shù)組的方式訪問接口
<?php
class Obj implements ArrayAccess {
public $container = [
"one" => 1,
"two" => 2,
"three" => 3,
];
public function offsetSet($offset, $value): void {
if (is_null($offset)) {
$this->container[] = $value;
} else {
$this->container[$offset] = $value;
}
}
public function offsetExists($offset): bool {
return isset($this->container[$offset]);
}
public function offsetUnset($offset): void {
unset($this->container[$offset]);
}
public function offsetGet($offset): mixed {
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);
?>
the above example will output something similar to : 輸出結(jié)果文章來源：http://www.zghlxwxcb.cn/news/detail-744372.html
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
)
)
php官網(wǎng)ArrayAccess文章來源地址http://www.zghlxwxcb.cn/news/detail-744372.html
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