How can I dynamiclly output the `key:value` of an array of objects?

Question

I have an array of objects that looks like this:

$custom_fields = json_decode($object->custom_fields);

// output: 
"custom_fields": [
    {"foo": "bar"},
    {"something": "else"},
    {"two_words": "example"},
    {"qty": 2},
    {"comments": "Hello World!"}
]

I have used this S.O. thread to see how I can output the values. However, in that thread the key is always the same.

What I am trying to accomplish is to populate a textarea with these key/values.

Foo: bar
Something: else
Two words: example
Qty: 2
Comments: Hello World!

I could hard-code these values; ideally I'd like it to be dynamic. Meaning, whatever is in the custom_fields array gets outputted. I may add or remove attributes in the future so not having things hard-coded is ideal.

Here's what I currently have:

$notes_arr = [];

foreach ($custom_fields as $field) {
    $notes_arr[] = $field;
}

$notes = 'Foo: ' . $notes_arr[0]->foo . PHP_EOL;
$notes .= 'Something: ' . $notes_arr[0]->something . PHP_EOL;
$notes .= 'Two Words: ' . $notes_arr[0]->two_words . PHP_EOL;
$notes .= 'Qty: ' . $notes_arr[0]->qty . PHP_EOL;
$notes .= 'Comments: ' . $notes_arr[0]->comments . PHP_EOL;

Which results in this:

Foo: bar
Something: else
Two Words: example
Qty: 2
Comments: Hello World!

How can I loop through the array & output the key Foo and the value bar dynamiclly?

I will work to resolve the two_words into Two words using str_replace or something next.

a combination of array_keys and get_object_vars should give a good place to start — Professor Abronsius
– Professor Abronsius, Commented Sep 24, 2023 at 18:16

Professor Abronsius · Accepted Answer · 2023-09-25 06:35:51Z

2

If you assume that the above source data $custom_fields could be written like this in PHP:

$custom_fields=[
    (object)["foo"=>"bar"],
    (object)["something"=>"else"],
    (object)["two_words"=>"example"],
    (object)["qty"=>2],
    (object)["comments"=>"Hello World!"]
];

If this was json_encode(d) you would get:

[{"foo":"bar"},{"something":"else"},{"two_words":"example"},{"qty":2},{"comments":"Hello World!"}] // ie:as question source!

Then a combination of the foreach with array_keys and array_values applied to each child object, like this:

$notes='';
foreach( $custom_fields as $obj ){
    $key=array_keys( get_object_vars( $obj ) )[0];
    $val=array_values( get_object_vars( $obj ) )[0];
    $notes .= sprintf('%s: %s%s',$key,$val,PHP_EOL);
}
printf('<textarea cols=80 rows=5>%s</textarea>',$notes);

should yield:

<textarea cols=80 rows=5>
    foo: bar
    something: else
    two_words: example
    qty: 2
    comments: Hello World!
</textarea>

It should also be mentioned that one can use the second argument to json_decode which will force the returned output to be delivered as an associative array. With such output conventional foreach can be applied - where the nested objects will now be child arrays (so rather than an array of objects it is now an array of arrays )

$custom_fields = json_decode( $object->custom_fields, true );
$notes='';
foreach( $custom_fields as $index => $arr ){
    foreach( $arr as $key => $val )$notes .= sprintf('%s: %s%s',$key,$val,PHP_EOL);
}
printf('<textarea cols=80 rows=5>%s</textarea>',$notes);

edited Sep 25, 2023 at 6:35

answered Sep 24, 2023 at 18:28

Professor Abronsius

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1 Comment

Damon Over a year ago

Your comment to explore array_keys and get_object_vars was super helpful - exactly the push I needed—thank you!!

Maxim Kurchinskyj · Accepted Answer · 2023-09-24 18:53:45Z

0

Php class is iterable you can try this:

 <?php

$array = '{"custom_fields": [
    {"foo": "bar"},
    {"something": "else"},
    {"two_words": "example"},
    {"qty": 2},
    {"comments": "Hello World!"}
]}';

   $ar = json_decode($array);

   foreach($ar->custom_fields as $key => $obj ){
     foreach($obj as $property => $val){
        echo $property."=>".$val."\t\n";
     }
   }

Output:

foo=>bar
something=>else
two_words=>example
qty=>2
comments=>Hello World!

edited Sep 24, 2023 at 18:53

answered Sep 24, 2023 at 18:45

Maxim Kurchinskyj

264 bronze badges

Comments

Mojtaba · Accepted Answer · 2023-09-24 19:46:55Z

0

This should work:

function printLines(string $input, bool $print = true) {
    // If the first or last line is empty, trim it.
    $input = trim($input);
    $rows = explode(PHP_EOL, $input);
    foreach($rows as $index => $row) {
        $row = trim($row);
        if(empty($row)) {
            //If the line is empty, nothing to print.
            unset($rows[$index]);
            continue;
        }
        $row = explode(':', $row);
        $row[1] = $row[1] ?? '';
        $rows[$index] = $row;
        if($print) {
            echo "{$row[0]}: {$row[1]}" . PHP_EOL;
        }
    }
    
    return array_values($rows);
}

DEMO: https://onlinephp.io/c

answered Sep 24, 2023 at 19:46

Mojtaba

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