代码如下：
echo "<pre>"; //可以用于程序代码测试,下面的程序实现了超时退出的功能 $start_time = time(); $singal = false; //使用全局变量跳出死循环 function check_timeout(){ global $start_time; global $singal; $timeout = 5; if(time()-$start_time>$timeout){ $singal = true; } } register_tick_function('check_timeout'); declare(ticks = 5){ $num = 0; while (1) { $a = 0; $num = ++$num; if($singal == true){ //break; goto signal; //使用goto跳转到指定的位置，也可以使用break中断循环跳出 } } } signal:; //测试declare执行的代码块，作用范围 $tmp = 0; function timer() { global $tmp; echo $tmp.'<br>'; } //注册tick方法 register_tick_function("timer"); //设定每执行几条语句执行已注册的方法这里设置了3条/每次 declare(ticks=2){ echo "<pre>"; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; $tmp += 1; } //测试ticks是否能使用常量，经过测试ticks的值必须是一个数字 echo "<pre>"; define('LINES',2); $i = 0; function test(){ global $i; echo "<br>exec lines:".(LINES * $i); $i++; } register_tick_function('test'); declare(ticks=2){ function getInfo(){ $sum = 0; for($j = 0; $j<100;$j++){ $sum = $sum + $j; } return $sum; } echo "<br>".getInfo(); }
运行结果：
0 2 4 6 8 10
10 exec lines:010 exec lines:210 exec lines:410 exec lines:610 exec lines:810 exec lines:1010 exec lines:1210 exec lines:1410 exec lines:1610 exec lines:1810 exec lines:2010 exec lines:2210 exec lines:2410 exec lines:2610 exec lines:2810 exec lines:3010 exec lines:3210 exec lines:3410 exec lines:3610 exec lines:3810 exec lines:4010 exec lines:4210 exec lines:4410 exec lines:4610 exec lines:4810 exec lines:5010 exec lines:5210 exec lines:5410 exec lines:5610 exec lines:5810 exec lines:6010 exec lines:6210 exec lines:6410 exec lines:6610 exec lines:6810 exec lines:7010 exec lines:7210 exec lines:7410 exec lines:7610 exec lines:7810 exec lines:8010 exec lines:8210 exec lines:8410 exec lines:8610 exec lines:8810 exec lines:9010 exec lines:9210 exec lines:9410 exec lines:9610 exec lines:9810 exec lines:100 495010 exec lines:102综上:decalare(ticks=num)这里num是执行多少行代码，num必须是整形数字。在执行到num的倍数行时回去调用
register_tick_function注册的函数逻辑