使用带循环引用的print_r和var_dump [英] Using print_r and var_dump with circular reference

问题描述

我正在使用 MVC框架Symfony ，而且似乎很多内置我想调试的对象有循环引用。这使得不可能使用 print_r（）或 var_dump（）打印变量（因为它们遵循循环引用广告无限或者直到过程用尽内存（以先到者为准）。

I'm using the MVC framework Symfony, and it seems a lot of the built-in objects I want to debug have circular references. This makes it impossible to print the variables with print_r() or var_dump() (since they follow circular references ad infinitum or until the process runs out of memory, whichever comes first).

而不是将自己的 print_r 克隆与一些情报，那里有更好的选择吗？我只想能够将变量（对象，数组或标量）打印到日志文件，HTTP头或网页本身。

Instead of writing my own print_r clone with some intelligence, are there better alternatives out there? I only want to be able to print a variable (object, array or scalar), either to a log file, http header or the web page itself.

编辑：至澄清问题是什么，请尝试此代码：

to clarify what the problem is, try this code:

<?php

class A
{
    public $b;
    public $c;

    public function __construct()
    {
        $this->b = new B();
        $this->c = new C();
    }
}

class B
{
    public $a;

    public function __construct()
    {
        $this->a = new A();
    }
}

class C
{
}

ini_set('memory_limit', '128M');
set_time_limit(5);

print_r(new A());
#var_dump(new A());
#var_export(new A());

它不适用于 print_r（）， var_dump（）或 var_export（）。错误消息是：

It doesn't work with print_r(), var_dump() or var_export(). The error message is:

PHP致命错误：允许的内存大小为134217728个字节（尝试分配523800个字节）在print_r_test.php中第10行

PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 523800 bytes) in print_r_test.php on line 10

推荐答案

我们正在使用PRADO框架，它有一个内置的类 TVarDumper可以很好地处理这些复杂的对象 - 甚至可以将它格式化在很好的HTML中。语法突出显示。您可以从 HERE 。

We are using the PRADO Framework and it has a built in class called "TVarDumper" which can handle such complex objects pretty well - it even can format it in nice HTML incl. Syntax Highlighting. You can get that class from HERE.

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