How to debug PHP functions with Symfony VarDumper?

How to use Symfony VarDumper to debug PHP functions? Installation: Install VarDumper via Composer. Usage: CLI: Use the var_dump() function to pass variables to VarDumper. Web requests: configure the DebugBundle and use the dump() function. Practical example: Debugging complex arrays: VarDumper presents array structures in a user-friendly format, showing their keys and values. Debugging Objects: VarDumper displays the class and private properties of an object, making it easy to view its status.

How to use Symfony VarDumper to debug PHP functions

Introduction

Symfony VarDumper is Powerful tool for debugging PHP functions and variables. It can present complex data structures in a user-friendly way and is easy to use with CLI or web requests.

Installation

Install VarDumper via Composer:

composer require symfony/var-dumper

Usage

CLI

In the CLI, variables can be passed to VarDumper using the var_dump() function:

var_dump($variable);

VarDumper will output the variable in a readable format.

Web Request

In order to use VarDumper in a Web request, you need to configure the DebugBundle:

# app/config/config.yml
framework:
    debug: true
    profiler:
        collect: true

Then, you can use it# in a controller or template ##dump() Function:

// 控制器
dump($variable);

// 模板
{{ dump(variable) }}

Practical case

Debugging complex array

$array = [
    'name' => 'John Doe',
    'address' => [
        'street' => '123 Main Street',
        'city' => 'Anytown',
        'state' => 'CA',
    ],
];

var_dump($array);

array(2) {
  ["name"]=>
  string(7) "John Doe"
  ["address"]=>
  array(3) {
    ["street"]=>
    string(11) "123 Main Street"
    ["city"]=>
    string(7) "Anytown"
    ["state"]=>
    string(2) "CA"
  }
}

Debug Object

class Person {
    private $name;

    public function __construct($name)
    {
        $this->name = $name;
    }

    public function getName()
    {
        return $this->name;
    }
}

$person = new Person('John Doe');
var_dump($person);

Person(1) {
  +name: private string => John Doe
}

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