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PHP printing Yang Hui triangle comprehensive example

WBOY
Release： 2016-07-25 09:12:53
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例子，php打印杨辉三角。

  3. $params=getParams(1);

  4. $argv0=trim($params[0]);
  6. if(!is_numeric($argv0))
  7. {
  8. error_msg("params 1 must be a numbers");
  9. }

  10. $spaceNumber=6;

  11. $maxn=$argv0;
  13. output("",true);
  14. get_trangle($argv0);
  15. error_msg("execute success");
  17. function get_trangle($n){
  18. if($n <= 0)
  19. { // bbs.it-home.org
  21. return false;
  22. }
  23. if($n==1)
  24. {
  25. $this_level=array(1);
  26. print_line($this_level,$n);
  27. return array(1);
  28. }
  29. if($n==2)
  30. {
  31. $this_level=array(1,1);
  32. print_line(array(1),1);
  33. print_line($this_level,$n);
  34. return $this_level;
  35. }
  36. $last_level=get_trangle($n-1);
  37. if(!is_array($last_level)||count($last_level) < 2)
  38. {
  40. return false;
  41. }
  42. $this_level=array();
  43. $this_level[0]=1;
  45. for($i=0;$i< count($last_level)-1;$i++)
  46. {
  47. $this_level[$i+1]=$last_level[$i]+$last_level[$i+1];
  48. }
  49. $this_level[]=1;
  50. print_line($this_level,$n);
  51. return $this_level;
  52. }
  54. function print_line($aArray,$n)
  55. {
  56. global $maxn,$spaceNumber;
  57. $line=sprintf("%".(($maxn-$n)*$spaceNumber/2)."s","");
  58. foreach($aArray as $i)
  59. {
  60. $line.=sprintf("%".$spaceNumber."s",$i);
  61. }
  62. output($line);
  63. }
  65. function getParams($paramNum)
  66. {
  67. $in=file_get_contents("in.txt");
  68. if($in===FALSE){
  69. error_msg("cannot read in.txt,please check in.txt existsn");
  70. }
  71. $in=preg_replace("/(s+)/i", " ", $in);
  73. $parms=split(" ",trim($in));
  74. if($parms===FALSE)
  75. {
  76. error_msg("cannot get param from in.txtn");
  77. }
  78. if(count($parms) < $paramNum)
  79. {
  80. error_msg("it needs $paramNum paramsn");
  81. }
  82. return $parms;
  83. }
  84. //输出 杨辉三角
  85. function output($msg,$isClean=false)
  86. {
  87. if($isClean)
  88. {
  89. $handle = fopen('out.txt', 'w');
  90. fclose($handle);
  91. }
  92. error_log($msg."n", 3, "out.txt");
  93. }
  95. function error_msg($msg,$is_exit=true)
  96. {
  97. if($is_exit)
  98. die($msg."n");
  99. else
  100. echo $msg."n";
  101. }
  102. ?>

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php打印杨辉三角综合实例
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