PHP array types and values

Question

How I turn that kind of data $pessoas->nome for $pessoas['nome'] and vice versa with php and because they are different?

Answer 1

You can change the typing by using (array).

$pessoas = new stdClass;
$pessoas->nome = 'Papa Charlie';
$pessoas = (array) $pessoas;


//output: Array( [nome] => Papa Charlie )
print_r( $pessoas );


// output: Papa Charlie
echo $pessoas['nome'];

---

The reverse process by changing the typing using (object).

$pessoas = array( 'nome' => 'Papa Charlie' );
$pessoas = (object) $pessoas;


// output: stdClass Object( [nome] => Papa Charlie )
print_r( $pessoas );


// output: Papa Charlie
echo $pessoas-> nome;

See an example on Ideone.

Answer 2

The $pessoas->nome indicates that people are an object. Already $pessoas['nome'] indicates an array. You can transform the names present in objects into arrays (as long as they are not static) using the function get_object_vars( object $object ).

Read more about objects on http://php.net/manual/en/language.oop5.php

Answer 3

Array vs Objects

That "little arrow" there $pessoas->nome is the Object Separator. He is responsible for access to members belonging to an object (whether property or method).

In the first case $pessoas->nome, the objeto could be any class. In PHP, the default object is stdClass.

You can use the var_dump in this case to know the name of the class from which the object originates.

In the case of $pessoas['nome'] you are accessing the members of a array in PHP.

So, look at these examples to be able to fix better:

Example of Array

$array = array('nome' => 'wallace');

echo $array['nome']; // Imprime: 'wallace'

Example of objeto (stdClass);

$object = new stdClass;

$object->nome = 'Wallace';

echo $object->nome; // Imprime: 'wallace';

get_class($object); // Imprime: 'stdClass'

Arrayaccess interface

There are cases where you can use both shapes, both for objects and for arrays. This happens in any class that implements the interface ArrayAccess.

PHP defaults to a class that implements ArrayAccess, which is the ArrayObject (see what more demonstrative name!)

Behold:

$arr_and_obj = new ArrayObject();

$arr_and_obj->nome = 'wallace';

$arr_and_obj['idade'] = 25;

echo $arr_and_obj->nome; // Imprime: 'wallace';

echo $arr_and_obj['idade']; // Imprime: 25

In this case, only classes that implement this interface accept this "double access form". In other cases, an error will be generated:

Behold:

$obj = new stdClass;

$obj[1];

Exit:

Cannot use Object of type stdClass as array

Conversion between types

As quoted in the @Ivanferrer reply, you can convert these types.

Object to array:

$obj = new stdClass;

$obj->nome = 'wallace';

var_dump((array)$obj);

Array for object:

$obj = (object) array('nome' => 'Wallace');

These two forms quoted above are called cast.

There is also another conversion were, which is through the function settype.

Behold:

$object = new stdClass;

settype($object, 'array');

var_dump($object); // Imprime: Array(0){}

Answer 4

With "arrow" you are referencing the attribute of an object (Object), with brackets, you are referencing the key of the matrix (array). To switch the typing, you would have to force the typing or do a "cast":

class Test {

public $valor = 'teste';

}

$objeto = new Test();

$array['valor'] = 'teste';

/* 1. a variável se torna um array $variavelArray['valor']
   2. O valor do atributo referenciado passará a ser
      tratado como array. */ 
$variavelArray  = (array) $objeto;
/* 1. a variável se torna um objeto $variavelObject->valor
   2. O valor do array passa a ser um atributo uma new StdClass; */
$variavelObject = (object) $array;

Here is an example: http://ideone.com/xgkA7x

In many cases, it is necessary to make this conversion, but there are people who do it as a "gambiarra" to solve problems that could be treated in a much more elegant way.

Answer 5

If you use the class PDO php itself will have the options when making a query for example, you can use the:

PDO::FETCH_OBJ for object, in case it will be returned and access the attributes through the $pessoas->nome or using the PDO::FETCH_ASSOC returns in array form as $pessoas['nome'].

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