Count amount of elements from nested array

Question

In the for loop I am trying to count the amount of flights in a nested array decoded from a JSON feed. Unfortunately it only shows 2 flights, when more flights are available. What am I doing wrong?

Json feed example from endpoint

{
  "response": [
    {
      "flight": {
        "number": "6204",
        "iata_number": "HV6204",
        "icao_number": "TRA6204"
      }
    },
    {
      "flight": {
        "number": "7012",
        "iata_number": "TB7012",
        "icao_number": "JAF7012"
      }
    },
    {
      "flight": {
        "number": "6652",
        "iata_number": "HV6652",
        "icao_number": "TRA6652"
      }
    },
    {
      "flight": {
        "number": "1925",
        "iata_number": "W61925",
        "icao_number": "WZZ1925"
      }
    },
    {
      "flight": {
        "number": "5075",
        "iata_number": "W65075",
        "icao_number": "WZZ5075"
      }
    },
    {
      "flight": {
        "number": "4289",
        "iata_number": "W64289",
        "icao_number": "WZZ4289"
      }
    },
    {
      "flight": {
        "number": "7861",
        "iata_number": "W67861",
        "icao_number": "WZZ7861"
      }
    },
    {
      "flight": {
        "number": "3066",
        "iata_number": "FR3066",
        "icao_number": "RYR3066"
      }
    }
  ]
} .

The PHP code example

<?php    
$url = 'https://api.endpoint'; // path to JSON file
$data = file_get_contents($url); 
$flights = json_decode($data, true); 

for($i=0; $i<=count($flights['response'][0]['flight']['iata_number']); $i++) {
    echo "Flightnumber" . $flights['response'][$i]['flight']["iata_number"] . '<br/>';
}
?>

Any help is very appreciated

u_mulder · Accepted Answer · 2019-10-29 20:46:47Z

2

What really should be used here is foreach. With foreach you don't have to care about count() of your array:

$url = 'https://api.endpoint'; // path to JSON file
$data = file_get_contents($url); 
$flights = json_decode($data, true); 

foreach ($flights['response'] as $item) {
    echo $item['flight']['iata_number'] . '<br />';
}

Simple demo is here.

If you still want to use for-loop, it should look like:

for ($i = 0; $i < count($flights['response']); $i++) {
    echo $flights['response'][$i]['flight']['iata_number'] . '<br />';
}

answered Oct 29, 2019 at 20:46

u_mulder

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1 Comment

stevv Over a year ago

Thanks! This helped a lot!

parttimeturtle · Accepted Answer · 2020-02-24 20:08:17Z

1

for($i=0; $i<count($flights['response'][0]['flight']['iata_number']); $i++) {
    echo "Flightnumber" . $flights['response'][$i]['flight']["iata_number"] . '<br/>';
}

count($flights['response'][0]['flight']['iata_number']) is always going to equal one, so you're only looping twice as would be expected (two flights). My guess is that's supposed to be count($flights['response']) or something similar.

edited Feb 24, 2020 at 20:08

answered Oct 29, 2019 at 20:27

parttimeturtle

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1 Comment

Patrick Q Over a year ago

The <= should also be changed to just <

Rakesh Jakhar · Accepted Answer · 2019-10-30 06:19:30Z

0

You can use array_walk_recursive

 array_walk_recursive($jarr, function($v, $k) use (&$flights){
  if($k == 'iata_number') $flights[] = $v;
});

Live example :- https://3v4l.org/5Rp9K

answered Oct 30, 2019 at 6:19

Rakesh Jakhar

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