php程序调试

 <?php$a = 199;print "[debug] a=".$a."<br>";//调试代码$b = 200;print "[debug] b=".$b."<br>";//调试代码$s = $a + $b;echo "100 + 200 = ".$s;?>

<?phpfunction func($a=0, $b=0)//计算两个变量的和{return $a+$b;}$a = 1;$b = 2;$s = func($a, $b);//获得两个变量的和echo $s;?>