PHP array comparing

Question

I want to compare two arrays in php. I don't want to do it overall, but block by block.
kind of like this

if (a[1] == b[1]){ // do something }
if (a[2] == b[2]){ // do more }

how can i do this without a whole bunch of ifs ?

thanks in advance :)

$a = array(1, 2, 3, 5);
$b = array(1, 1, 1, 1);
$c = array('something', 'something', 'and so forth');
foreach($a as $key => $value){
   if($value == $b[$key]){
      echo $c[$key]. '<br />';
    }
}

my answer. compare 2 arrays, then rune some code. triggered by the blocks that match

Answer 1

for($i=0;$i<sizeof(a);$i++){
  if(a[$i]==b[$i]){
    //DO SOMETHING
  }
}

Answer 2

want to compare whole array element one by one (assuming both array of same length)

foreach($a as $key => $value){
   if($value == $b[$key])
   {
     // do something
   }
   else
   {
     break;  // stop doing something and break
   }
}

if want to compare some keys

$keys = array('key1', 'key2');
foreach($keys as $value){
   if($a[$value] == $b[$value])
   {
     // true
   }
   else
   {
     // false
   }
}

Answer 3

$a = array(1, 3 , 5 ,6 , 7);
$b = array(3, 1, 5, 6, 8 ,9);
$array_size = min(count($a), count($b));

for ($i = 0; $i < $array_size; $i++) {
   if ($a[$i] == $b[$i]) { //you could/should check whether the index is present. 
    //some code
   }
}

This only works for arrays with the same uniformly distributed numerical index.

Answer 4

 foreach(array_intersect_assoc($a,$b) as $key => $data)){
     switch($key){
         case 1:
             //something
             break;
         case 2:
             //something
             break;
     }
 }

Answer 5

for ($i=0; $i < count($a) && $i < count($b); ++$i) {
    if ($a[$i] == $b[$i]){
      // this is true
    } else {
      // this is false
    }
}

Answer 6

A good ol for loop should do the trick. You can start with an array of things to do:

$arrayOfThingsToDo = array( "someFunc", "anotherFunc", "yetAnotherFunc" );
$arrayOfA = array( "one", "two", "three" );
$arrayOfB = array( "one", "not two", "three" );

function doCompare($a, $b, $f) {
   $len = count($a);
   for($i = 0; $i < $len; $i++) {
      if($a[$i] == $b[$i]) {
         $f[$i]();
      }
   }
}

Good luck!