void var_dump ( mixed expression [, mixed expression [, …]])
此函数显示关于一个或多个表达式的结构信息,包括表达式的类型与值。数组将递归展开值,通过缩进显示其结构。
- function a_test($str) //自定义函数
- {
- echo "nhi: $str"; //输出参数
- var_dump(debug_backtrace()); //输出backtrace
- }
- a_test('friend'); //调用用户自定义函数
再来看一个var_dump遍历对象实例吧
- class foo {
- private $a;
- public $b = 1;
- public $c='phpfensi.com';
- private $d;
- static $e;
- public function test() {
- var_dump(get_object_vars($this));
- }
- }
- $test = new foo;
- var_dump(get_object_vars($test));
- $test->test();
注意:为了防止程序直接将结果输出到浏览器,可以使用输出控制函数来捕获此函数的输出,并把它们保存到一个例如 string 类型的变量中。
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波比源码 » php var_dump简单测试
波比源码 » php var_dump简单测试
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