Question

am working on php loops and i find myself that i need to write a nested loop bur when i try to combine foreach and for loop it yield to unexpected result
Here are my codes

       foreach ($district_ward as $key => $value) {
           $ward_ids = array_keys($district_ward[$key]);
           echo $key;
           for ($x = 0; $x < count($ward_ids)-1; $x++) {
               $district_village[$key]= array_merge($value[$ward_ids[$x]], $value[$ward_ids[$x+1]]);
           }               
        }

This gives me this

347

but when i print the value of $key within the for loop, that is

        foreach ($district_ward as $key => $value) {
           $ward_ids = array_keys($district_ward[$key]);
           for ($x = 0; $x < count($ward_ids)-1; $x++) {
   echo $key;
               $district_village[$key]= array_merge($value[$ward_ids[$x]], $value[$ward_ids[$x+1]]);
           }
        }

i get this

3

Answer 1

I’m just going to guess that your 2nd and 3rd array are only one entry long. The condition for the loop specifies $x < count($ward_ids) - 1. If your array only has one entry, one – 1 will make it loop 0 times. In other words, your inner loop is not executed at all.