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run code in 200+ php & hhvm versions
Bugs & Features
<?php function intdiv_1($a, $b){ return ($a - $a % $b) / $b; } function int_div($dividend, $divisor){ $res; if (function_exists('intdiv')) $res=intdiv($dividend, $divisor); else // < php7 $res=intdiv_1($dividend, $divisor); return $res; } class Sheet { private $size; //1,2 or 4 private $sections=array()/* = array(4) { "1"=>null, "2"=>null, "3"=>null, "4"=>null }*/; public function __construct($dim, $arg) { $this->size = $dim; if (is_array($arg)==true && sizeof($arg)==$dim) {//building a sheet of 2 or 4 $i=1; foreach($arg as $elem) $this->sections[$i++]=$elem; return; } else { if (is_array($arg)==false && $dim==1) //buidling a sheet of 1 $this->sections[1]= $arg; else throw new Exception("Incompatible arguments"); } } public function __toString() { $ret='-'; foreach($this->sections as $key=>$val) $ret .= (string)$val; return $ret.'-'; } public function divide(){ //return first the left or upper section of the shhet $ret1; //left or upper part of the sheet $ret2; //right or lower part of the shet switch($this->size) { case 4: //vertical cut $arr1=array($this->sections[1],$this->sections[3]); $ret1=new Sheet(2,$arr1); $arr2=array($this->sections[2],$this->sections[4]); $ret2=new Sheet(2,$arr2); break; case 2: //horizontal cut $ret1 = new Sheet(1,$this->sections[1]); $ret2 = new Sheet(1,$this->sections[2]); break; default: throw new Exception("Value must be 2 or 4"); } $this->size /= 2; return array($ret1,$ret2); } public function toArray(){ $ret=[]; foreach($this->sections as $val) $ret[]=$val; return $ret; } } class SheetPile{ private $sheets=array(); private $sheetSize; public function __construct($size){ $this->sheetSize=$size; } public function __toString() { $ret='A stack of '.$this->sheetSize."-sized sheets:\n"; foreach($this->sheets as $val) $ret .= (string)$val."\n"; return $ret; } public function add($sheet){ //sheets are stacked one below the other starting from the upper one array_push($this->sheets, $sheet); } public function divide(){ //return first the left or upper section of the pile in form of SheetPiles $pile1=new SheetPile($this->sheetSize/2); $pile2=new SheetPile($this->sheetSize/2); switch($this->sheetSize) { case 2:case 4: //horizontal(2) or vertical(4) cut foreach($this->sheets as $elem){ list($s1,$s2)= $elem->divide(); $pile1->add($s1); $pile2->add($s2); } break; default: throw new Exception("Value must be 2 or 4"); } return array($pile1,$pile2); } public function stackUp(){ //left pile ($this) is placed over the right one, upper pile ($this) over the other list($pile1,$pile2)=$this->divide(); $pile1->sheets = array_merge($pile1->sheets,$pile2->sheets); return $pile1; } public function SingleSheetPile_To_Array(){ if ($this->sheetSize!=1) throw new Exception("This function applies only to Pile of Sheets with size 1"); else { $ret=[]; foreach($this->sheets as $elem) $ret=array_merge($ret,$elem->toArray()); return $ret; } } } function A4toA6($num_pages) { $n =1+int_div($num_pages-1, 4); $arr; $pp=1; for($i=1;$i<=$n;$i++){ for($j=0;$j<4;$j++){ $val=$i+$j*$n; $arr[$i][$j]=($val>$num_pages)?" ":$val; //arr[page][quarter(0-3 from left to right from top to bottom] } } return $arr; } function verify_A4toA6($num_pages) { $arr=A4toA6($num_pages); $pile=new SheetPile(4); foreach($arr as $val){ //for every page $sheet4 = new Sheet(4,$val); $pile->add($sheet4); } $pile=$pile->stackUp(); //from 4 to 2 $pile=$pile->stackUp(); //from 2 to 1 $pages=[]; for($i=1;$i<=$num_pages;$i++) $pages[]=$i; return $pages==$pile->SingleSheetPile_To_Array(); } print_r(3==3);print_r(3==33); print("SHEEEEEET\n"); $s1 = new Sheet(1,0);print($s1."\n"); $s2 = new Sheet(2,array(2,4));print($s2."\n"); list($a,$b)=$s2->divide();print("V:\n");print($a."\n");print($b); $s4 = new Sheet(4,array(3,5,7,9));print("\n".$s4."\n"); print("sheetdiv\n"); list($a,$b)=$s4->divide();print("\nH:\n");print($a."\n");print($b); print("PILEEEEEE\n"); $q1 = new Sheet(4,array(1,3,5,7));$q2 = new Sheet(4,array(2,4,6,8)); $p = new SheetPile(4); $p->add($q1);$p->add($q2);print($p); $d1=new Sheet(2,array(2,4)); $d2 = new Sheet(2,array(7,8)); $pp = new SheetPile(2);$pp->add($d1);$pp->add($d2);print($pp); $u1=new Sheet(1,4); $u2=new Sheet(1,1); $ppp = new SheetPile(1);$ppp->add($u1);$ppp->add($u2);print($ppp); print("pilediv\n"); print_r($p->stackUp()->stackUp()->SingleSheetPile_To_Array()); print_r(verify_A4toA6(8));
based on aLBPb
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
1SHEEEEEET -0- -24- V: -2- -4- -3579- sheetdiv H: -37- -59-PILEEEEEE A stack of 4-sized sheets: -1357- -2468- A stack of 2-sized sheets: -24- -78- A stack of 1-sized sheets: -4- -1- pilediv Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 ) 1
Output for hhvm-3.22.0
1SHEEEEEET -0- -24- Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 V: -2- -4- -3579- sheetdiv Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 H: -37- -59-PILEEEEEE A stack of 4-sized sheets: -1357- -2468- A stack of 2-sized sheets: -24- -78- A stack of 1-sized sheets: -4- -1- pilediv Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 Notice: Undefined variable: ret1 in /in/psb75 on line -1 Notice: Undefined variable: ret2 in /in/psb75 on line -1 Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 ) 1
Output for hhvm-3.18.5 - 3.21.3
1SHEEEEEET -0- -24- Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 V: -2- -4- -3579- sheetdiv Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 H: -37- -59-PILEEEEEE A stack of 4-sized sheets: -1357- -2468- A stack of 2-sized sheets: -24- -78- A stack of 1-sized sheets: -4- -1- pilediv Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 Notice: Undefined variable: ret1 in /in/psb75 on line 45 Notice: Undefined variable: ret2 in /in/psb75 on line 46 Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 ) 1