PHP Selection & Looping Statements

1. PHP Selection & Looping Statements

2. Control Structures Programming Languages commonly include a number of “control structures”, that allow users to execute based on evaluation. Blocks of statements are enclosed in curly brackets ({}). PHP includes the following control structures: • IF-ELSE • WHILE • FOR • SWITCH

3. Conditional Operators

4. Conditional Operators

5. Control Structure #1IF-ELSE *NOTE: the else is optional

6. if Statements if ($number > 10) echo “That is a big number”; if ($number > 10) { echo “<BR> The number is greater than 10.”; echo “<BR> So, it must be big.”; } if ($number > 10) echo “<BR> That’s a big number.”; else echo “<BR> That’s a small number.”;

7. if Statements if ($number > 10) { echo “<BR> The number is greater than 10.”; echo “<BR> So, it must be big.”; } else { echo “<BR> The number is less or equal to 10.”; echo “<BR> So, it must be small.”; }

8. if Statements if ($number > 10) if ($number > 100) echo “<BR>That is a very big number.”; else { echo “<BR> The number is greater than 10.”; echo “<BR> So, it must be big.”; } else echo “<BR>That is a small number.”;

9. if Statements if ($number > 100) echo “<BR>That’s a very big number.”; elseif ($number > 10) echo “<BR>That is a big number.”; elseif ($number > 1) echo “<BR> That is a small number.”; else echo “<BR> That is a very small number.”;

10. Control Structure #2SWITCH

11. switch Statement switch ($number) { case 1: echo “small”; break; case 2: echo “medium”; break; case 3: echo “large”; break; default: echo “That is not a valid code.”; }

12. Control Structure #3FOR

13. for statement $sum = 0; for ($n=1; $n<=3; $n++) $sum += $n; echo “<BR> The sum of the integers from 1 to $number is $sum.”;

14. Control Structure #3WHILE NOTE: $timeleft- - is equivalent to $timeleft = $timeleft -1

15. while statement $n = 0; $sum = 0; while ($n <=3) { $sum = $sum + $n; $n++; } echo “The sum is $sum”;