Building an associative array using for loop in php

Question

I am trying to create an associative array using php. My desired output is

Array
(
     [key] => fl_0_sq
),
Array
(
     [key] => fl_1_sq
)

The code is

  $max_val = 2;  
  for($i=0; $i<$max_val; $i++)
  {
        $flr_arr .= "array('key' => 'fl_".$i."_sq'),";      
  }
  print_r($flr_arr);

Output is

array('key' => 'fl_0_sq'),array('key' => 'fl_1_sq'),

Now the issue is that it has become a string instead of an array. Is it at all possible to create a array structure like the desired output. Any help is highly appreciated.

nanocv · Accepted Answer · 2016-10-31 23:43:49Z

1

You could do this:

<?php

$flr_arr = [];

$max_val = 2;
for ($i = 0; $i < $max_val; $i++) {
  $flr_arr[][key] = 'fl_' . $i . '_sq';
}

$output = "<pre>";

foreach ($flr_arr as $i => $flr_arr_item) {
  $output .= print_r($flr_arr_item, true);
  if($i < count($flr_arr)-1){
    $output = substr($output, 0, -1) . ",\n";
  }
}
$output .= "</pre>";

echo $output;

The output:

Array
(
    [key] => fl_0_sq
),
Array
(
    [key] => fl_1_sq
)

edited Oct 31, 2016 at 23:43

answered Oct 31, 2016 at 23:06

nanocv

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3 Comments

Prithviraj Mitra Over a year ago

Thanks mate. Tomasz solution is pretty close. I need to insert a comma though after each array ends.

nanocv Over a year ago

@PrithvirajMitra Here you go ;) now it has the exact formatting you want

Prithviraj Mitra Over a year ago

Sorry for replying late. Yes that works really great. I had some other key elements so I have to adjust anyway. Thanks once again for your help.

Tomasz Winter · Accepted Answer · 2016-10-31 23:06:26Z

0

I'm not exactly sure what you want to do, but your output could be done by this:

  $max_val = 2;
  for($i=0; $i<$max_val; $i++)
  {
        $flr_arr = [];
        $flr_arr['key'] = 'fl_".$i."_sq';
        print_r($flr_arr);
  }

answered Oct 31, 2016 at 23:06

Tomasz Winter

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2 Comments

Prithviraj Mitra Over a year ago

Almost there. Thanks a lot. Last thing I need to know that is how can I insert a comma after each array ends.

Tomasz Winter Over a year ago

echo ',' isn't enough?

Kayson · Accepted Answer · 2016-10-31 23:07:20Z

0

You're declaring a string and concatenating it. You want to add elements to an array. You also can't create multiple arrays with the same name. What you can do, though is a 2D array:

$flr_arr[] = array("key"=>"fl_$i_sq");

Note the lack of quotes around array(). The "[]" syntax adds a new element to the end of the array. The output would be -

array(array('key' => 'fl_0_sq'),array('key' => 'fl_1_sq'))

answered Oct 31, 2016 at 23:07

Kayson

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