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(array) type of strange behavior of the object to convert the array

I used to have a code block and it works fine, but in some cases it throws a PHP notification:

Here is the code:

$json = '{"1455260079":"Tracking : #34567808765098767 USPS","1455260723":"Delivered","1455261541":"Received Back"}';

$json_obj = json_decode($json);
$json_array = (array) $json_obj;
var_dump($json_array);
print_r($json_array);

echo $json_array["1455260079"]."\n";

output:

array(3) {
  ["1455260079"]=>
  string(34) "Tracking : #34567808765098767 USPS"
  ["1455260723"]=>
  string(9) "Delivered"
  ["1455261541"]=>
  string(13) "Received Back"
}
Array
(
    [1455260079] => Tracking : #34567808765098767 USPS
    [1455260723] => Delivered
    [1455261541] => Received Back
)

Notice: Undefined index: 1455260079 in /in/PULrp on line 14

So, I changed the code above and it works great.

$json_array = json_decode($json, true);
var_dump($json_array);
print_r($json_array);
echo $json_array["1455260079"]."\n";

output:

array(3) {
  [1455260079]=>
  string(34) "Tracking : #34567808765098767 USPS"
  [1455260723]=>
  string(9) "Delivered"
  [1455261541]=>
  string(13) "Received Back"
}
Array
(
    [1455260079] => Tracking : #34567808765098767 USPS
    [1455260723] => Delivered
    [1455261541] => Received Back
)
Tracking : #34567808765098767 USPS

But here I am a little confused why type conversion (array)does not work in this code. I know that json_decode($json, true)is the best option for converting json string to array, but is $json_array = (array) $json_obj;also a valid option.

When looking at var_dumpboth codes, it shows some difference, but print_rboth arrays are exactly the same.

I am curious to know why such different things happened in var_dumpboth, and how does the (array)casting type convert an object to an array in the first case?

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: https://3v4l.org/PULrp

+4
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( script):

<?php
$json = '{"1455260079":"Tracking : #34567808765098767 USPS","1455260723":"Delivered","1455261541":"Received Back"}';

$json_obj = json_decode($json);
$json_array = (array) $json_obj;
var_dump($json_array);
print_r($json_array);

$newerArray = array();

echo "json_array contents: \n";
foreach($json_array as $k => $v){
    echo "k: $k " . gettype($k) . ", v: $v " . gettype($v) . "\n";
    $newerArray[$k] = $v;
}

echo "\n";

echo "newerArray contents: \n";
foreach($newerArray as $k => $v){
    echo "k: $k " . gettype($k) . ", v: $v " . gettype($v) . "\n";
}

echo $json_array["1455260079"]."\n";
echo $newerArray["1455260079"]."\n";

:

array(3) {
  ["1455260079"]=>
  string(34) "Tracking : #34567808765098767 USPS"
  ["1455260723"]=>
  string(9) "Delivered"
  ["1455261541"]=>
  string(13) "Received Back"
}
Array
(
    [1455260079] => Tracking : #34567808765098767 USPS
    [1455260723] => Delivered
    [1455261541] => Received Back
)
json_array contents: 
k: 1455260079 string, v: Tracking : #34567808765098767 USPS string
k: 1455260723 string, v: Delivered string
k: 1455261541 string, v: Received Back string

newerArray contents: 
k: 1455260079 integer, v: Tracking : #34567808765098767 USPS string
k: 1455260723 integer, v: Delivered string
k: 1455261541 integer, v: Received Back string

Notice: Undefined offset: 1455260079 in /in/Eq1OI on line 24

Tracking : #34567808765098767 USPS

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+3

PHP.

(undefined ):

$json_array = (array) $json_obj;

:

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json_decode($json_string, true) .

( print_r var_dump):

var_dump :

, . , .

print_r:

, float, , . , , . .

qoutes var_dump qoutes print_r.

+2

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