how can I access to a specific element in json - php

Question

I have a JSON from telegram, In php How can find that if it is a text do something, but if its photo, audio or ... do something else. this part is located after date, how can I access it?
I tried by access it by index like ['message'][1] but I got error.
{
"ok": true,
"result": [
{
"update_id": 30213598,
"message": {
"message_id": 41,
"from": {
"id": 102768333,
"first_name": "QWr_1",
"username": "john"
},
"chat": {
"id": 108768733,
"first_name": "QWr_1",
"username": "john"
},
"date": 1439233778,
"text": "this is a test"
}
},
{
"update_id": 30213599,
"message": {
"message_id": 46,
"from": {
"id": 108768733,
"first_name": "QWr_1",
"username": "john"
},
"chat": {
"id": 108768733,
"first_name": "QWr_1",
"username": "john"
},
"date": 1439234126,
"photo": [
{
"file_id": "AgADBAAD4acxG92tewa8uRLrpBBo-h1icjAABCohC6S9uPdhViIAAgI",
"file_size": 1923,
"width": 90,
"height": 90
},
{
"file_id": "AgADBAAD4acxG92tewa8uRLrpBBo-h1icjAABOT4Q5CJoFOVVSIAAgI",
"file_size": 24105,
"width": 320,
"height": 320
},
{
"file_id": "AgADBAAD4acxG92tewa8uRLrpBBo-h1icjAABK2WgDnJ74jlVCIAAgI",
"file_size": 57650,
"width": 640,
"height": 640
}
]
}
},

Answer 1

You need to use json_decode function.
I use foreach loop then echo $item['message']['message_id'] to display message_id in following example.
Try Example
$json = <<<JSON
{
"ok": true,
"result": [
{
"update_id": 30213598,
"message": {
"message_id": 41,
"from": {
"id": 102768333,
"first_name": "QWr_1",
"username": "john"
},
"chat": {
"id": 108768733,
"first_name": "QWr_1",
"username": "john"
},
"date": 1439233778,
"text": "this is a test"
}
},
{
"update_id": 30213599,
"message": {
"message_id": 46,
"from": {
"id": 108768733,
"first_name": "QWr_1",
"username": "john"
},
"chat": {
"id": 108768733,
"first_name": "QWr_1",
"username": "john"
},
"date": 1439234126,
"photo": [
{
"file_id": "AgADBAAD4acxG92tewa8uRLrpBBo-h1icjAABCohC6S9uPdhViIAAgI",
"file_size": 1923,
"width": 90,
"height": 90
},
{
"file_id": "AgADBAAD4acxG92tewa8uRLrpBBo-h1icjAABOT4Q5CJoFOVVSIAAgI",
"file_size": 24105,
"width": 320,
"height": 320
},
{
"file_id": "AgADBAAD4acxG92tewa8uRLrpBBo-h1icjAABK2WgDnJ74jlVCIAAgI",
"file_size": 57650,
"width": 640,
"height": 640
}
]
}
}
]
}
JSON;
$json_data = json_decode($json, true);
foreach($json_data['result'] as $item)
{
if(isset($item['message']['text']))
{
echo $item['message']['text']."<br />";
}
if(isset($item['message']['photo']))
{
foreach($item['message']['photo'] as $photo)
{
echo "file_id: ".$photo['file_id']."<br />";
echo "file_size: ".$photo['file_size']."<br />";
}
}
}