PHP - How to echo Value from Multidimensional Array

Question

I have:

$request = Array
(
    [ID] => 2264
    [SUCCESS] => Array
        (
            [0] => Array
                (
                    [MESSAGE] => Service Details
                    [LIST] => Array
                        (
                            [retail_name] => 
                            [credit_admin] => FREE
                            [credit] => 0
                            [discount_admin] => 0
                            [discount] => 0
                            [cartdiscount] => 0

If I do:

echo $request[ID];                            // it says: 2264
echo $request[SUCCESS];                       // it says: Array
echo $request[SUCCESS][0][MESSAGE];           // it says: Service Details

But I need to echo "credit" and if I do:

echo $request[SUCCESS][0][LIST];           // I get ERROR
echo $request[SUCCESS][0][LIST][credit];   // I get ERROR

I dont understand why? How can I do it? Thank you

Answer 1

You aren't using quotes to specify the array keys. you should use ['ID'] instead of [ID]

PHP fixes this for you and presumes you meant ['ID'] instead of [ID] and trows a notice in the logs

This doen't work for [LIST] however because LIST is a reserved keyword. That means that list has a function in PHP. PHP doesn't know which one you need and doesn't return result.

Change [LIST] to ['LIST'] and you should recieve your values. Please learn to use arrays with quotes, to prevent errors like this in the future

Answer 2

Depends on Your Key and Value

If your array key has a value it will directly output that

for ex

 echo $request[ID];  

b'coz id directly holds a value;

But

$request[SUCCESS]; 

// holds an array. you cannot echo a array directly 
// to do something like this you will need the key of your inner 
// array with outer array in combinations to echo the values 

for ex

 echo $request[SUCCESS][0]['MESSAGE'];  

// Key "O" holds an array also. so you need to use its inner array keys

same needs to be done for

 echo $request[SUCCESS][0]['MESSAGE']['LIST']['credit_admin']; 
 // where again list is a array 

Answer 3

Previously every string without quotes was treated like string if there was no Constant defined under this name, but from PHP 7.2 now issues error of level E_WARNING . Why is $foo[bar] wrong?

PHP Warning:  Use of undefined constant test - assumed 'test' (this will throw an Error in a future version of PHP)

In this example list is treated as construct list() . Using bare strings in associative arrays as keys is deprecated and should be avoided.

Correct way is to call it with quotes (single or double):

echo $request['SUCCESS'][0]['LIST'];
echo $request['SUCCESS'][0]['LIST']['credit'];