How to get index numbers of array in PHP using foreach?

Question

I'm trying to parse data from an TV Shows API, but I'm having trouble figuring out how to get the index numbers.

Example:

{
"data": {
    "0": {
        "1": {
            "param1": "value1", 
            "param2": "warning", 
        }
    }, 
    "1": {
        "1": {
            "param1": "value1", 
            "param2": "value2", 
        }, 
        "2": {
            "param1": "value1", 
            "param2": "warning", 
        }, 
        "3": {
            "param1": "value1", 
            "param2": "warning", 
        }, 
    }
}
}

The "params" and "values" I'm able to get just fine, but I can't 'echo' the index numbers.

This is how I'm trying to do it:

$string = file_get_contents(api);
$json_a = json_decode($string, true);
foreach ($json_a['data'] as $seasons) {
    foreach ($seasons as $episodes) {
            if ($episodes['param2']=="warning") {
            // echo index number of season
            // echo index number of episode

            }
    }
}

I believe I've read that using foreach I'm not able to get the index numbers? If so, what would be the solution?

I tried 'manually' incrementing variables for season number and episodes, but index numbers may vary. They may not be sequential and some start with index "1" instead of "0".

Don't forget to accept the answer here that most helped you - seems to have been answered by several people. — halfer
– halfer, Commented Sep 25, 2012 at 14:45

Matt K · Accepted Answer · 2012-08-13 21:55:35Z

1

Use foreach (array_expression as $key => $value) instead of just foreach (array_expression as $value). The $key is what you're missing.

PHP: foreach

answered Aug 13, 2012 at 21:55

Matt K

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1 Comment

user1596553 Over a year ago

Thank you so much everyone, I was indeed missing the '$key' parameter in foreach. It's working perfectly now :)

WayneC · Accepted Answer · 2012-08-13 21:55:44Z

1

You don't need a counter, just add the key in your definition of the foreach

eg.

$test = array('foo' => 'bar');

foreach($test as $key => $value) {
    echo $key . "\n";
    echo $value;
}

Outputs

foo
bar

http://php.net/manual/en/control-structures.foreach.php

answered Aug 13, 2012 at 21:55

WayneC

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Comments

halfer · Accepted Answer · 2012-08-13 21:56:28Z

0

Try this:

foreach ($json_a['data'] as $index1 => $seasons) {}

and similarly:

foreach ($seasons as $index2 => $episodes) {}

answered Aug 13, 2012 at 21:56

halfer

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Comments

alpera · Accepted Answer · 2012-08-13 22:43:03Z

i couldnt encode your json but,

used an array like:

array
  0 => 
    array
      1 => 
        array
          'param1' => string 'value1' (length=6)
          'param2' => string 'warning' (length=7)
  1 => 
    array
      1 => 
        array
          'param1' => string 'value1' (length=6)
          'param2' => string 'warning' (length=7)
      2 => 
        array
          'param1' => string 'value1' (length=6)
          'param2' => string 'value2' (length=6)

and here is the code:

$a[0][1] = array("param1"=>"value1","param2"=>"warning");
$a[1][1] = array("param1"=>"value1","param2"=>"warning");
$a[1][2] = array("param1"=>"value1","param2"=>"value2");

foreach($a as $key=>$val)
{
    foreach($val as $skey => $sval)
    {
        if($sval['param2']=="warning")
            echo $key."-".$skey."<br>";
    }
}

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