Combine certain values in one array with values in another array

Question

I would like to combine the values which contain the prefix lt_ in $url with the values in $color and create a new array $new. Both arrays $url and $color store values for the next 36 hours:

print_r($url);

outputs

 Array(
     [0]  => "http://example.com/color/green.png",
     [1]  => "http://example.com/color/lt_green.png",
     [2]  => "http://example.com/color/lt_blue.png",
     [3]  => "http://example.com/color/blue.png",
     [4]  => "http://example.com/color/blue.png",
     [5]  => "http://example.com/color/yellow.png",
     ..
     [35] => "http://example.com/color/lt_blue.png",
     );

and

print_r($color);

outputs

Array(
     [0]  => "Green",
     [1]  => "Green",
     [2]  => "Blue",
     [3]  => "Blue",
     [4]  => "Blue",
     [5]  => "Yellow",
     ...
     [35] => "Blue",
     );

I have managed to find the string part lt_ in $url and get the keys in $new but how can I add "Light" (or lt_) to the corresponding values in $color to populate $new?

$new = array(
     [0]  => "Green",
     [1]  => "Light Green",
     [2]  => "Light Blue",
     [3]  => "Blue",
     [4]  => "Blue",
     [5]  => "Yellow",
     ...
     [35] => "Light Blue",
 );

I have managed to create an array with only the keys which values contain lt_:

$lt = 'lt_';
foreach($url as $key1=>$value1)
{
  foreach($color as $key2=>$value2)
  {
      if (strpos($value1,$lt) !== false)
      {
          $new[$key1] = array();
      }
  }
}

do both arrays have the same size? Do the indexes of both arrays correspond to each other? — acontell
– acontell, Commented Feb 1, 2015 at 17:01
@acontell Yes, both arrays are the same size and the indexes correspond to one another. — sweet potato
– sweet potato, Commented Feb 1, 2015 at 17:04
@acontell Thanks! I have to run an errand, I'll be back in a while and try it out! — sweet potato
– sweet potato, Commented Feb 1, 2015 at 17:22

acontell · Accepted Answer · 2015-02-01 17:06:43Z

1

If both arrays have the same size and the indexes correspond, you can iterate and add to the new array the color with the prefix or without it depending on the condition:

$arr = Array("http://example.com/color/green.png",
    "http://example.com/color/lt_green.png",
    "http://example.com/color/lt_blue.png",
    "http://example.com/color/blue.png",
    "http://example.com/color/blue.png",
    "http://example.com/color/yellow.png",);

$arr2 = Array(
    "Green",
    "Green",
    "Blue",
    "Blue",
    "Blue",
    "Yellow",);

$new = array();
for ($i = 0; $i < count($arr2); $i += 1) {
    (strpos($arr[$i], 'lt_') !== false) ?
                    $new[] = "Light " . $arr2[$i] :
                    $new[] = $arr2[$i];
}
print_r($new);

answered Feb 1, 2015 at 17:06

acontell

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1 Comment

sweet potato Over a year ago

That's a great answer and it does exactly what I needed. Thank you!

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