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Home  >  Article  >  Backend Development  >  PHP algorithm example sharing

PHP algorithm example sharing

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WBOYOriginal
2016-07-25 08:44:371047browse

Only print 0

　The specific number is determined by the input parameter n

　If n=5, print 00000

  2. $n = $_GET['n'];
  3. for ($i=0; $i < $n; $i++) {
  4. echo "0";
  5. }
  6. ? >
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Print a line 0101010101010101010101

　The specific number is determined by the input parameter n

　For example test.php?n=3 print 010

  2. $n = $_GET['n'];
  3. for ($i=0; $i < $n; $i++) {
  4. if ($i % 2 ==0 ) {
  5. echo "0";
  6. } else{
  7. echo "1";
  8. }
  9. }
  10. ?>
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Achieve 1 00 111 0000 11111

　for if implementation

  3. for ($i = 0; $i < 10; $i++) {
  4. for ($j = 0; $j <= $i; $j++) {
  5. if ($i % 2 == 0) {
  6. echo '0';
  7. } else {
  8. echo '1';
  9. }
  10. }
  11. echo '
    ';
  12. }
  14. ?>
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　For switch implementation

  3. for ($i = 0; $i < 10; $i++) {
  4. for ($j = 0; $j <= $i; $j++) {
  5. switch ($j % 2) {
  6. case '0':
  7. echo "0";
  8. break;
  9. case '1':
  10. echo "1";
  11. break;
  12. }
  13. }
  14. echo '
    ';
  15. }
  17. ?>
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　while if implementation

　while switch implementation

  3. $i = 0;
  4. while ($i < 10) {
  5. $j = 0;
  6. while ($j <= $i) {
  7. switch ($i % 2) {
  8. case 0:
  9. echo '0';
  10. break;
  11. case 1:
  12. echo '1';
  13. break;
  14. }
  15. $j++;
  16. }
  17. echo '
    ';
  18. $ i++;
  19. }
  21. ?>
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Achieve 0 01 010 0101……

Achieve 0 01 012 0123 3210 210 10 0

Make a calculator

　For example, test.php?a=1&b=2&operator=jia outputs 3

　For example, test.php?a=5&b=2&operator=jian outputs 3

　For example, test.php?a=2&b=5&operator=cheng outputs 10

　For example, test.php?a=6&b=3&operator=chu outputs 2

  2. $a = $_GET['a'];
  3. $b = $_GET['b'];
  4. $operator = $_GET['operator'];
  5. function calculate($ a,$b,$operator) {
  6. switch ($operator) {
  7. case 'jia':
  8. $result = $a + $b;
  9. return $result;
  10. break;
  11. case 'jian':
  12. $result = $a - $b;
  13. return $result;
  14. break;
  15. case 'cheng':
  16. $result = $a * $b;
  17. return $result;
  18. break;
  19. case 'chu':
  20. $result = $a / $b;
  21. return $result;
  22. break;
  23. }
  24. }
  25. echo calculate($a,$b,$operator);
  26. ?>
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