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About PHP arrays?

  • RedBMedia
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Post January 15th, 2009, 12:30 pm

Lets say i want to execute blocks of code based on the values of an array. Why then doesn't the below example code work?

Code: [ Select ]
<?php
$numbers = array("1","5","7");

switch ($numbers)
{
case 1:
echo "Number 1";
break;
case 2:
echo "Number 2";
break;
case 3:
echo "Number 3";
break;
case 4:
echo "Number 4";
break;
case 5:
echo "Number 5";
break;
case 6:
echo "Number 6";
break;
case 7:
echo "Number 7";
break;
case 8:
echo "Number 8";
break;
default:
echo "No number between 1 and 3";
}
?>
  1. <?php
  2. $numbers = array("1","5","7");
  4. switch ($numbers)
  5. {
  6. case 1:
  7. echo "Number 1";
  8. break;
  9. case 2:
  10. echo "Number 2";
  11. break;
  12. case 3:
  13. echo "Number 3";
  14. break;
  15. case 4:
  16. echo "Number 4";
  17. break;
  18. case 5:
  19. echo "Number 5";
  20. break;
  21. case 6:
  22. echo "Number 6";
  23. break;
  24. case 7:
  25. echo "Number 7";
  26. break;
  27. case 8:
  28. echo "Number 8";
  29. break;
  30. default:
  31. echo "No number between 1 and 3";
  32. }
  33. ?>


With this code i should get: "Number 1 Number 5 Number 7" instead i get the default "No number between 1 and 3". Its as if the array isn't even there. Any ideas on what I am doing wrong?
Joe Hall
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Post January 15th, 2009, 12:30 pm

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Post January 15th, 2009, 1:09 pm

Well, the first thing is the break statement would return only the first match and then break. Second, I would think that the case statement should be checking for strings (i.e. "1" and "5", not 1 and 5) since that is how the array is defined. As for using switch statements with an array, I don't know if that is possible. From the PHP.net:

Quote:
The case expression may be any expression that evaluates to a simple type, that is, integer or floating-point numbers and strings. Arrays or objects cannot be used here unless they are dereferenced to a simple type.


I would think looping through the array and running the switch statement would be the way to go.

Code: [ Select ]
<?php
$numbers = array("1","5","7");
function switch_array($arr){
for($i=0;$i<sizeof($arr);$i++){
switch ($arr[$i])
{
case "1":
echo "Number 1";
break;
 
case "2":
echo "Number 2";
break;
 
case "3":
echo "Number 3";
break;
 
case "4":
echo "Number 4";
break;
 
case "5":
echo "Number 5";
break;
 
case "6":
echo "Number 6";
break;
 
case "7":
echo "Number 7";
break;
 
default:
echo "No Numbers between 1 and 7";
}
}
}
switch_array($numbers);  //Outputs Number 1Number 5Number 7
?>
  1. <?php
  2. $numbers = array("1","5","7");
  3. function switch_array($arr){
  4. for($i=0;$i<sizeof($arr);$i++){
  5. switch ($arr[$i])
  6. {
  7. case "1":
  8. echo "Number 1";
  9. break;
  10.  
  11. case "2":
  12. echo "Number 2";
  13. break;
  14.  
  15. case "3":
  16. echo "Number 3";
  17. break;
  18.  
  19. case "4":
  20. echo "Number 4";
  21. break;
  22.  
  23. case "5":
  24. echo "Number 5";
  25. break;
  26.  
  27. case "6":
  28. echo "Number 6";
  29. break;
  30.  
  31. case "7":
  32. echo "Number 7";
  33. break;
  34.  
  35. default:
  36. echo "No Numbers between 1 and 7";
  37. }
  38. }
  39. }
  40. switch_array($numbers);  //Outputs Number 1Number 5Number 7
  41. ?>
  • RedBMedia
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Post January 15th, 2009, 1:28 pm

Wow, thanks so much, it works great. Yeah, I didn't know if the switch function could handle arrays or not.
Joe Hall

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