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浅析php变量修饰符static的使用_PHP

Jun 01, 2016 pm 12:05 PM
php static

静态变量仅在局部函数域中存在,但当程序执行离开此作用域时,其值并不丢失。看看下面的例子:
复制代码 代码如下:
function test(){
static $a=0;
$a++;
echo $a;
}

test();//1
test();//2
test();//3
Note: 静态变量可以按照上面的例子声明。如果在声明中用表达式的结果对其赋值会导致解析错误。
复制代码 代码如下:
static $a=0+1;
static $a=sqrt(121);

像上面的赋值方式会报错,不信你试试

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