PHP - Array to object - Issue when getting object variable by index [duplicate]

Question

I am just trying to understand why the last two print_r() calls below are not working and throws the following error Undefined property: stdClass::$0. According to the PHP Documentation, I should be able to access the object numeric property using the the following operator $object->{'x'} ( x is the numeric index I want to access ).

Thanks.

$array = (object)array( 
    0 => 'test1',
    1 => 'test2',
    2 => 'test3',
    'test' => (object)array(
        0 => 'hi1',
        1 => 'hi2',
        2 => 'hi3'
    )
);

print_r( $array );

print_r( $array->test );

print_r( $array->test->{'0'} );

print_r( $array->{'0'} );

die();

Answer 1

This is PHP brokenness. Curly-brace syntax for object property access does not work for all-digit keys.

Answer 2

When typecasting an array to an object, all-numeric keys are converted into integer properties; and integer properties cannot be accessed.

$array = array(0 => 'a', 1.5 => 'b', '2' => 'c');

var_dump((object) $array);

// object(stdClass)#1 (3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }

However, when using curly bracket notation to set all-numeric properties they are stored as strings; which can be accessed.

$array = (object) array();

$array->{0}   = 'a';

$array->{1.5} = 'b';

$array->{'2'} = 'c';

var_dump($array);

// object(stdClass)#1 (3) { ["0"]=> string(1) "a" ["1.5"]=> string(1) "b" ["2"]=> string(1) "c" }

Hence the issue you're having.

Answer 3

this is work :

 $array = (object)array( 
    a => 'test1',
    b => 'test2',
    c => 'test3',
    'test' => (object)array(
        a => 'hi1',
        b => 'hi2',
        c => 'hi3'
    )
);

print_r( $array );

print_r( $array->test );

print_r( $array->test->a);

print_r( $array->b );

die();