What is the difference between if.. else-if, else and switch statement

Discussion in 'PHP' started by webdeveloper24, Oct 4, 2012.

0
  1. #1
    I know the difference between if..elseif and switch statement but I have one confusion When I actually use switch case statement though I can solve it by using if..elseif and else statement.
     
    webdeveloper24, Oct 4, 2012 IP
  2. sarahk

    sarahk iTamer Staff

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    #2
    Switch tests the same variable over and over

    if elseif allows you to test different variables

    eg 
    switch($status) {
   case 'Open': 
      sendOpenEmail();
      break;
   case 'Closed':
      sendClosedEmail();
      break;
}

if ($status == 'Open') sendOpenEmail();
elseif ($status == 'Closed' && $validEmail && $outcome == 'Accepted') sendClosedEmail();
    PHP:
     
    sarahk, Oct 6, 2012 IP
  3. Bhuvan14

    Bhuvan14 Peon

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    #3
    if or else if is the better performance than switch statement. so use if else statement if u have need
     
    Bhuvan14, Oct 8, 2012 IP
  4. funty

    funty Greenhorn

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    #4
    both of them has similar work. you can do the same thing using if..else which u can do with switch but not viceversa for complex problems. Switch is not preferred usually by professional programmers, it is actually more compact, quite readable but still lot limited in functionality
     
    funty, Oct 9, 2012 IP
  5. Drent123

    Drent123 Peon

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    #5
    All are conditional statement and switch used at the place for if-else for less memory utilization.
     
    Drent123, Oct 9, 2012 IP
  6. plussy

    plussy Peon

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    #6
    they both work similar but have still small but important differences.

    switch does NOT support multiple conditions 
    if ($var==true and $var2>10) {
    PHP:
    The above would not be possible to be easily and cleanly implemented with swutch.

    also you can use switch to share output between cases

    
swicth ($var1) {

 case '1':
 case '3': echo $var1; break;
 case '2' : echo 'YAY ';
 case '4':
case '5': echo 'YEEHAA'; brerak;
}
    PHP:
    the above would result in this

    case 1: 1
    case 2: YAY YEEHAA
    case 3: 3
    case 4: YEEHAA
    case 5: YEEHAA


    so small differences but these differences decide when it is better to use if elseif or switch

    hope it helped.
     
    plussy, Oct 10, 2012 IP
  7. thegioivt

    thegioivt Peon

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    #7
    Both of them has similar work. If your conditions so much you should use swicth.
     
    thegioivt, Oct 10, 2012 IP