PHP print Yang Hui triangle integrated Example

Example, php print Yang Hui triangle. $params =getparams (1); $ARGV 0=trim ($params [0]); if (!is_numeric ($argv 0)) { Error_msg ("Params 1 must be a numbers"); } $spaceNumber = 6; $MAXN = $argv 0; Output ("", true); Get_trangle ($argv 0); Error_msg ("execute success"); function Get_trangle ($n) { if ($n <= 0) {//bbs.it-home.org return false; } if ($n ==1) { $this _level=array (1); Print_line ($this _level, $n); return Array (1); } if ($n ==2) { $this _level=array (a); Print_line (Array (1), 1); Print_line ($this _level, $n); return $this _level; } $last _level=get_trangle ($n-1); if (!is_array ($last _level) | | Count ($last _level) < 2) { return false; } $this _level=array (); $this _level[0]=1; for ($i =0; $i < count ($last _level)-1; $i + +) { $this _level[$i +1]= $last _level[$i]+ $last _level[$i +1]; } $this _level[]=1; Print_line ($this _level, $n); return $this _level; } function Print_line ($aArray, $n) { Global $MAXN, $spaceNumber; $line =sprintf ("%". ($MAXN-$n) * $spaceNumber/2). " S "," "); foreach ($aArray as $i) { $line. =sprintf ("%". $spaceNumber. " S ", $i); } Output ($line); } function Getparams ($paramNum) { $in =file_get_contents ("In.txt"); if ($in ===false) { Error_msg ("Cannot read in.txt,please check in.txt exists\n"); } $in =preg_replace ("/(\s+)/I", "", $in); $parms =split ("", Trim ($in)); if ($parms ===false) { Error_msg ("Cannot get param from in.txt\n"); } if (count ($parms) < $paramNum) { Error_msg ("It needs $paramNum params\n"); } return $parms; } Output Yang Hui triangle function output ($msg, $isClean =false) { if ($isClean) { $handle = fopen (' OUT.txt ', ' W '); Fclose ($handle); } Error_log ($msg. " \ n ", 3," OUT.txt "); } function error_msg ($msg, $is _exit=true) { if ($is _exit) Die ($msg. " \ n "); Else echo $msg. " \ n "; } ?> Copy Code

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