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php里的declare用法

2024-07-08 18:24:38   226人阅读

function tick_handler ()
		{
			echo  "tick_handler() called<br>" ;
		}
		 function  tick_handler1 ()
		{
			echo  "tick_handler1() called<br>" ;
		}
 register_tick_function ( ‘tick_handler‘ );
		 register_tick_function ( ‘tick_handler1‘ );
declare( ticks = 1 ){
			 $a  =  1 ;
			if ( $a  >  0 ) {
				 $a  +=  2 ;
				print( $a );
			}
		}
		exit;
这里首先定义了两个函数，然后注册到系统，随后通过declare定义一个ticks，步长为1，作用是在declare作用域中的代码每执行ticks次步长，就执行一次注册的方法，方法顺与注册的顺序一致。
所以上面的执行结果是：
tick_handler() called
tick_handler1() called
tick_handler() called
tick_handler1() called
3tick_handler() called
tick_handler1() called
tick_handler() called
tick_handler1() called
tick_handler() called
tick_handler1() called
tick_handler() called
tick_handler1() called
这个方法可以测试执行代码的处理时间。






























        

            
                
                  
                
                

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