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This document uses PHP Chinese website manual Release
对象接口提供一个面向对象的方式来访问扩展接口。下面的例子显示了使用对象化接口实现上面的例子。此例子的输出,除了所显示“计数器无效!”变为由 PHP 发出的变量 $counter_three 不是对象的警告信息以外,其他完全一样。此例子展示了定义在扩展中定义的 Counter 的子类,并对实例变量而不是用方法存取计数器的值。
Example #1 "counter" 的对象化接口
<?php
class MyCounter extends Counter
{
public function printCounterInfo () {
printf ( "计数器的名称为 '%s',且%s进行持久化。其当前值为 %d.\n" ,
$this -> getMeta ( COUNTER_META_NAME ),
$this -> getMeta ( COUNTER_META_IS_PERSISTENT ) ? '' : '不' ,
$this -> value );
}
}
Counter :: setCounterClass ( "MyCounter" );
if (( $counter_one = Counter :: getNamed ( "one" )) === NULL ) {
$counter_one = new Counter ( "one" , 0 , COUNTER_FLAG_PERSIST );
}
$counter_one -> bumpValue ( 2 ); // 不允许直接 "set" 值
$counter_two = new Counter ( "two" , 5 );
$counter_three = Counter :: getNamed ( "three" );
$counter_four = new Counter ( "four" , 2 , COUNTER_FLAG_PERSIST | COUNTER_FLAG_SAVE | COUNTER_FLAG_NO_OVERWRITE );
$counter_four -> bumpValue ( 1 );
$counter_one -> printCounterInfo ();
$counter_two -> printCounterInfo ();
$counter_three -> printCounterInfo ();
$counter_four -> printCounterInfo ();
?>