UNSW ProgComp: Problem 3 - 2006

<?php

$input = <<<END
#5 #9 #4X
#4 #9 X#4 XX
#3 #9 X  #3*  X#7 #9 #5X
  #9 X  #5*  X#3 #9 #3X#5 XX
#8 #4X #7* #3X#6 #4X #9 XX
#6 XX#3 X #6*  #9X#7 #9 #2X #3X
#4 XX#6 X #4*  X#9 #9 #9 X** X
#3 X#8 XX#4 XX#5 X#4 #9 #9 X#3*X
  X#9 //#4X#7 X#4 #9 #9 #4X
 X#9 //#3 X  #9 #9 #9 XX
X#9 //#4 X #9 #9X#9X/
X#5 #3X//#4 X #9 X
X#4 X#3 X  #3 X    #5 X
X#4 X#4 X#4 X#5    X
 X#3 X#4 X#4 X#8 X  #9 #9 XX
 X#4 X#3 X#4 X#8 X#8 #9 #3X  XX
  X#4 #3X#6 X#8 X#6 #9 X  X X  X
  X#4 #9 X#9 X#5 #9 XX X  #4X
#3 X#4 #9 X#9 #8X\#5 XX#3 XX  X
#4 XX#3 #9 XX#5 #9 X#5 X#4 X  XX
#6 XX#3 #9 #4X#3 #6X/#5 X#5 #4X
#8 #3X#4 #9 XX#3*#9 X#5 X
  #9 #4X#9X *#3 *#7 X#5 X
#6 #9 #9 *#3-* X#5 X#5 X
#5 #9 #9 *-* *#3 #3X X#5 X
#5 #9 #9 *- *#7 #3X#3 X
#4 #9 #9 *- *X #9 #3X
#4 #9 #9 *- *X  X #9 #3X
#3 #9 #9 *- *X#4 X#3 #9 XX
#3 #9 #9 *- *XX#4 X#4 #9 X
  #9 #9 *  *X* X#4 X#4 #9 X
  #9 #9 *  *#1X * X#4 X#4 #9 X
 #9 #9 *  * X**  X#3 #4X #9 X
 #9 #9 *  * X**  XX#5 X #9 X
#9 #9 *  ** X** X#5 XX #9 X
#9 #9 *  **  X*  #3X#3 X#9 X
#8 #9 *  **#4 XX#3 #4X#7 #3X
#7 #9 *  * *#6 #4X#6 X#5 X
#6 #9 *#3 * * #9 X#5 X#5 X
 #7=#7*#3 * *  #9 X#5 X#6 #8X\
#8 *#9 * *#6 /#5X#6 #8X\#6 )
#3 #5=*#9*  *#5 X#3 #9 #9 )  \  )
#5 #4=*#9 *#5 X#6 #9 \  \#3 )#5X
#9=*#9*#7 #4X#9X#9X
#2
 #9 #9 C#1U#1R#1SE Y#1O#1U, R#1ED B#1A#1R#1O#1N!
END;

//I think that this is going to involve simply walking through the string
//if '#' && char_pos+1 is num repeat follwing character char_pos+1 times
//else if char_pos+1 == '#' echo '#'
//else display ?
//then advance to the character after #dc or ##

$input = explode("\n", $input); //work on each line individually then add newline after line


foreach($input as $value){
    $line = str_split($value);
    $x = 0;
    $out_string = null;
    for($key = 0; $key < count($line); $key++){
        if($line[$key] == '#'){
            if(is_numeric($line[$key+1])){
                $out_string .= str_pad($line[$key+2], $line[$key+1], $line[$key+2], STR_PAD_RIGHT);
                $key += 2;
            }elseif($line[$key+1] == '#'){
                $out_string .= '#';
                $key += 1;
            }else{
                $out_string .= '?';
                $key += 1;
            }
        }else{
            $out_string .= $line[$key];
        }
    }
    echo $out_string."\n";
}