how do I concatenate the string values of two arrays pairwise with PHP?

Question

So I have two arrays

Array
(
[0] => test
[1] => test 1
[2] => test 2
[3] => test 3
)

and

Array
(
[0] => test         


        

Answer 1

If you have data coming from two different querys and they become two different arrays, combining them is not always an answer.

There for when placed into an array ([]) they can be looped with a foreach to count how many, then looped together.

Note: they must have the same amount in each array or one may finish before the other…..

foreach ($monthlytarget as $value) {
// find how many results there were
   $loopnumber++;
}

echo $loopnumber;

for ($i = 0; $i < $loopnumber; $i++) {
echo $shop[$i];
echo " - ";
echo $monthlytarget[$i];
echo "<br>";
}

This will then display: -

Tescos - 78
Asda - 89
Morrisons - 23
Sainsburys - 46

You can even add in the count number to show this list item number....

Answer 2

There's no built-in function (that I know of) to accomplish that. Use a loop:

$combined = array();
for($i = 0, $l = min(count($a1), count($a2)); $i < $l; ++$i) {
  $combined[$i] = $a1[$i] . $a2[$i];
}

Adapt the loop to your liking: only concatenate the minimum number of elements, concatenate empty string if one of the arrays is shorter, etc.

Answer 3

you loop through it to create a new array. There's no built-in function. Welcome to the wonderful world of programming :)

Hints:

• http://pt2.php.net/manual/en/control-structures.foreach.php
• You can combine two strings with "."