PHP JSON multiple echo value

Question

In addition to the question yesterday: Question

I got multiple (3) Items in the json file:

results.json

["{\"Produkt\":{\"Produktkategorie\":\"Artikel1\",\"Optionen\":{\"MaxBreite\":\"250\",\"MaxHoehe\":\"150\",\"MinBreite\":\"10\",\"MinHoehe\":\"5\",\"ProduktStaerke\":\"3\",\"KantenAuswahl\":\"Kante1\"}}}","{\"Produkt\":{\"Produktkategorie\":\"Artikel2\",\"Optionen\":{\"MaxBreite\":\"250\",\"MaxHoehe\":\"150\",\"MinBreite\":\"10\",\"MinHoehe\":\"5\",\"ProduktStaerke\":\"3\",\"KantenAuswahl\":\"Kante2\"}}}","{\"Produkt\":{\"Produktkategorie\":\"Artikel3\",\"Optionen\":{\"MaxBreite\":\"250\",\"MaxHoehe\":\"150\",\"MinBreite\":\"10\",\"MinHoehe\":\"5\",\"ProduktStaerke\":\"3\",\"KantenAuswahl\":\"Kante3\"}}}"]

I want echo all three value from "Produktkategorie" and the value "MaxBreite"

It should look like this:

Artikel1 - 250
Artikel2 - 250
Artikel3 - 250

My code looks like this:

$json = file_get_contents('results.json');
$json = json_decode($json, true);
$anzahl = count($json) -1;
$anzahlstart = 0;

while ($anzahlstart < $anzahl) {
$json = json_decode($json[$anzahlstart], true);                     
$ProduktkategorieFile = $json['Produkt']['Produktkategorie'];
$MaxBreiteFile = $json['Produkt']['Optionen']['MaxBreite'];                     
echo $ProduktkategorieFile. "-" .$MaxBreiteFile;
$anzahlstart ++; 
 }

Unfortunately my Code throws a error after passing first line:

Notice: Undefined offset: 1 in

After that I don't get any result.

Kings of coding, could you help me again please :)

Why are you using "json_decode" on the elements in the loop? it's already decoded... $anzahl is an object you can iterate in — Ofir Baruch
– Ofir Baruch, Commented Feb 1, 2017 at 12:46
the json is already decoded, your $json variable is an array after row 2 — Victor Radu
– Victor Radu, Commented Feb 1, 2017 at 12:47
this was the solution yesterday, plz look at the link in the description, or you got a better solution? :) — chim
– chim, Commented Feb 1, 2017 at 12:47
also NEVER reassign the value of a variable within the loop, just remove the first row in the loop — Victor Radu
– Victor Radu, Commented Feb 1, 2017 at 12:48
wihout the second decoding it throws the error: Notice: Undefined index: Produkt in — chim
– chim, Commented Feb 1, 2017 at 12:49

Death-is-the-real-truth · Accepted Answer · 2017-02-01 13:09:04Z

2

Do you need like this?:-

<?php
$json_string = file_get_contents('results.json');
$json = json_decode($json_string, true); 
// I hope the above line gives you exact json what you shown to us

foreach ($json as $jso){
   $array = json_decode($jso, true);
   echo $array['Produkt']['Produktkategorie'].' - '.$array['Produkt']['Optionen']['MaxBreite'];
   echo PHP_EOL;
}

Output:-https://eval.in/728430

Note:- If yes then I hope you are able to get other values easily.Thanks

edited Feb 1, 2017 at 13:09

answered Feb 1, 2017 at 13:00

Death-is-the-real-truth

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1 Comment

chim Over a year ago

Thank You this works for me, also the answer above :)

Death-is-the-real-truth · Accepted Answer · 2017-02-01 13:14:04Z

The problem is with the $json variable name: You're reassigning it on this line: $json = json_decode($json[$anzahlstart], true);

Rename this variable and you're good to go!

I would also replace the while loop with a foreach loop as shown in my example:

<?php
//With foreach
$original = '["{\"Produkt\":{\"Produktkategorie\":\"Artikel1\",\"Optionen\":{\"MaxBreite\":\"250\",\"MaxHoehe\":\"150\",\"MinBreite\":\"10\",\"MinHoehe\":\"5\",\"ProduktStaerke\":\"3\",\"KantenAuswahl\":\"Kante1\"}}}","{\"Produkt\":{\"Produktkategorie\":\"Artikel2\",\"Optionen\":{\"MaxBreite\":\"250\",\"MaxHoehe\":\"150\",\"MinBreite\":\"10\",\"MinHoehe\":\"5\",\"ProduktStaerke\":\"3\",\"KantenAuswahl\":\"Kante2\"}}}","{\"Produkt\":{\"Produktkategorie\":\"Artikel3\",\"Optionen\":{\"MaxBreite\":\"250\",\"MaxHoehe\":\"150\",\"MinBreite\":\"10\",\"MinHoehe\":\"5\",\"ProduktStaerke\":\"3\",\"KantenAuswahl\":\"Kante3\"}}}"]';
$decoded = json_decode($original);

foreach($decoded as $encodedProduct){
    $product = json_decode($encodedProduct,true)['Produkt'];
    echo $product['Produktkategorie'] . " - " . $product['Optionen']['MaxBreite'] . "\n";
}

//Original fixed code
$json = json_decode($original, true);
$anzahl = count($json);
$anzahlstart = 0;

while ($anzahlstart < $anzahl) {
    $decodedJson = json_decode($json[$anzahlstart], true);
    $ProduktkategorieFile = $decodedJson['Produkt']['Produktkategorie'];
    $MaxBreiteFile = $decodedJson['Produkt']['Optionen']['MaxBreite'];                     
    echo $ProduktkategorieFile. " - " .$MaxBreiteFile . "\n";
    $anzahlstart ++; 
 }

Community · Accepted Answer · 2017-05-23 12:16:41Z

0

Your problem is, that you are trying to decode an array of json string, instead of the string itself.

so that would be like this now.

$json = file_get_contents('results.json');
$json = json_decode($json[0], true); // notice [0];on this line.
...

After reading the other question, I have had this problem before, but you essentially need to do two things. in your ajax.

$.ajax({
   ...
   data : JSON.stringify(data)
})

This changes an object into a json string,

Then on your server you do the decode.

something like this

$json = json_decode($jsonstringGoesHERE , true);

For more information in understanding the issue, have a look at this other post.

jQuery ajax, how to send JSON instead of QueryString

edited May 23, 2017 at 12:16

CommunityBot

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answered Feb 1, 2017 at 12:49

Val

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4 Comments

Antony Over a year ago

This isn't the issue, he has 3 json strings in an array. He starts decoding the array, then decodes each inner json in a loop, but reassigned the $json variable which caused the error.

chim Over a year ago

yes i'm a noob in working with json file, but your answer clears a bit for me thank you!

Val Over a year ago

@Antony I would suggest, you read his results.json and that does not deserve a downvote,

Antony Over a year ago

@Val he initially decodes the json array, which contains 3 json strings, then loops through all of the values of the decoded array and decodes the inner string. He therefore is decoding the string itself, in the loop

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