diff --git a/php/day7.php b/php/day7.php
new file mode 100644
index 0000000..c46bd75
--- /dev/null
+++ b/php/day7.php
@@ -0,0 +1,251 @@
+<?php
+
+$printDebug = false;
+$debug = array();
+
+function setValue($data, $pos, $newVal, $mode){
+  if($mode == 1){
+    $data[ $pos ] = $newVal;
+    // return $pos;
+  }
+  else {
+    $data[ $data[$pos] ] = $newVal;
+    // return $data[$pos];
+  }
+  return $data;
+}
+function getValue($data, $val, $mode){
+  if($mode == 1){
+    return $data[ $val ];
+  }
+  else {
+    return $data[ $data[ $val ] ];
+  }
+}
+
+function Intcode($input, $inputParam = []){
+  global $printDebug;
+  $orgInputs = $inputParam;
+  $output = array();
+  $input0 = explode(",", trim($input));
+  $input1 = $input0;
+
+  $batchPos = 0;
+  $jumps = 0;
+  $executions = 0;
+
+  /*** OPCODE LOOP ***/
+  while($batchPos < count($input1)){
+    $executions++;
+    if($executions > 1000){ 
+      echo  "KILLED due to 1000 executions.";
+      break; 
+    }
+
+    //INSTRUCTIOnS
+    $instr = array_reverse( str_split( substr($input0[$batchPos],0,-2) ) );
+    $mode1 = @$instr[0];
+    $mode2 = @$instr[1];
+    $mode3 = @$instr[2];
+    $opcode = substr($input1[$batchPos],-2);
+
+    if($opcode == 99){
+      $debug[] = $batchPos.": ".$input1[$batchPos].",".$input1[$batchPos+1].", ".$input1[$batchPos+2].", ".$input1[$batchPos+3];
+      $debug[] = "Opcode $opcode: halts."."<br>\n";
+      $batchPos += 9999999; //PLEASE HALT DAMMIT
+      break;
+    }
+    elseif($opcode == 1){
+      $debug[] = $batchPos.": ".$input1[$batchPos].",".$input1[$batchPos+1].", ".$input1[$batchPos+2].", ".$input1[$batchPos+3];
+      
+      $newVal = (getValue($input1, $batchPos+1, $mode1) + getValue($input1, $batchPos+2, $mode2));
+      $debug[] = "Set new value to ".$newVal." (".getValue($input1, $batchPos+1, $mode1)."+".getValue($input1, $batchPos+2, $mode2).")";
+      $input1 = setValue($input1, $batchPos+3, $newVal, $mode3);
+
+      $batchPos += 4;
+    }
+    elseif($opcode == 2){
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1].", ".$input1[$batchPos+2].", ".$input1[$batchPos+3];
+
+      $newVal = (getValue($input1, $batchPos+1, $mode1) * (getValue($input1, $batchPos+2, $mode2)));
+      $input1 = setValue($input1, $batchPos+3, $newVal, $mode3);
+      $debug[] = "Set new value to ".$newVal;
+      
+      $batchPos += 4;
+    }
+    // ADDED for day 5
+    elseif($opcode == 3){ // Requires some input.
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1];
+      if(!empty($inputParam)){ 
+        $newValue = array_shift($inputParam);
+        $input1 = setValue($input1, $batchPos+1, $newValue, $mode1);
+        $debug[] = "Set ".$input1[$batchPos+1]."'s value to: ".$newValue;
+        // array_shift($inputParam);
+      }
+      else { 
+        echo "Wait for number!"."<br>";
+        $debug[] = "Wait for number...";
+        break;
+      }
+      
+      $batchPos += 2;
+    }
+    elseif($opcode == 4){
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1].", ".$input1[$batchPos+2];
+      // $output[] = "Opcode 4: ".$input1[ ($mode1 == 1?$batchPos+1:$input1[$batchPos+1]) ];
+      $output[] = getValue($input1, $batchPos+1, $mode1);
+      $debug[] = "Outputs: ".getValue($input1, $batchPos+1, $mode1);
+      $batchPos += 2;
+    }
+    // DAY 5, part 2:
+    elseif($opcode == 5){ //jump-if-true
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1].", ".$input1[$batchPos+2];
+      if(getValue($input1, $batchPos+1, $mode1) != 0){
+      // if($input1[$batchPos+1] != 0 && $jumps < 10){
+        // $batchPos = $input1[ ($mode2 == 1?$batchPos+2:$input1[$batchPos+2]) ];
+        
+        $newBatchPos = getValue($input1, $batchPos+2, $mode2);
+        $debug[] = "Jumped to ".$newBatchPos." (first value: ".getValue($input1, $batchPos+1, $mode1).")";
+        // $output[] = "Jumped to ".$newBatchPos;
+        $batchPos = $newBatchPos;
+      }
+      else {
+        $batchPos += 3;
+      }
+    }
+    elseif($opcode == 6){ //jump-if-false
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1].", ".$input1[$batchPos+2];
+      if(getValue($input1, $batchPos+1, $mode1) == 0){
+
+        $newBatchPos = getValue($input1, $batchPos+2, $mode2);
+        $debug[] = "Jumped to ".$newBatchPos." (first value: ".getValue($input1, $batchPos+1, $mode1).")";
+        // $output[] = "Jumped to ".$newBatchPos;
+        $batchPos = $newBatchPos;
+      }
+      else {
+        $batchPos += 3;
+      }
+    }
+    elseif($opcode == 7){ //less than
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1].", ".$input1[$batchPos+2].", ".$input1[$batchPos+3];
+      if(getValue($input1, $batchPos+1, $mode1) < getValue($input1, $batchPos+2, $mode2)){
+        $debug[] = "Value: ".getValue($input1, $batchPos+1, $mode1)." < ".getValue($input1, $batchPos+2, $mode2);
+        // $input1[($mode3 == 1?$batchPos+3:$input1[$batchPos+3])] = 1; 
+        $input1 = setValue($input1, $batchPos+3, 1, $mode3);
+      }
+      else { 
+        $debug[] = "Value: ".getValue($input1, $batchPos+1, $mode1)." !< ".getValue($input1, $batchPos+2, $mode2);
+        // $input1[($mode3 == 1?$batchPos+3:$input1[$batchPos+3])] = 0; 
+        $input1 = setValue($input1, $batchPos+3, 0, $mode3);
+      }
+      $batchPos += 4;
+    }
+    elseif($opcode == 8){
+      $debug[] = $batchPos.": ".$input1[$batchPos].", ".$input1[$batchPos+1].", ".$input1[$batchPos+2].", ".$input1[$batchPos+3];
+      if($input1[($mode1 == 1?$batchPos+1:$input1[$batchPos+1])] == $input1[($mode2 == 1?$batchPos+2:$input1[$batchPos+2])]){
+        $input1[($mode3 == 1?$batchPos+3:$input1[$batchPos+3])] = 1; 
+      }
+      else { 
+        $input1[($mode3 == 1?$batchPos+3:$input1[$batchPos+3])] = 0;
+      }
+      $batchPos += 4;
+    }
+    else {
+      $debug[] = $batchPos.": Unknown opcode: $input1[$batchPos]";
+      $output[] = "Unknown opcode: $input1[$batchPos]";
+      break;
+    }
+  }
+
+  if(empty($output)){ $output[] = "No outputs. Here is first value: ".$input1[0]; }
+
+  if($printDebug && !empty($debug)){ 
+    echo "<br><br>\n<b>Debug:</b> (Intcode(".'$input'.", <u><i>".implode(",",$orgInputs)."</i></u>))<br>".implode("<br>\n", $debug)."<br>\n"."<hr>"; 
+    $debug = [];
+  }
+
+  return implode("<br>\n", $output);
+}
+
+/*
+each amp runs an intcode
+phase settings, run exactly once
+*/
+
+$input = "3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0";
+$input = "3,23,3,24,1002,24,10,24,1002,23,-1,23,101,5,23,23,1,24,23,23,4,23,99,0,0";
+$input = "3,31,3,32,1002,32,10,32,1001,31,-2,31,1007,31,0,33,1002,33,7,33,1,33,31,31,1,32,31,31,4,31,99,0,0,0";
+$input = file_get_contents("day7.txt");
+
+// echo Intcode($input,13,0);
+// die();
+$maxThrust = 0;
+$lastOutput = 0;
+for($a=0;$a<=4;$a++){
+
+  for($b=0;$b<=4;$b++){
+    if($b!=$a){
+
+      for($c=0;$c<=4;$c++){
+        if($c!=$b && $c!=$a){
+
+          for($d=0;$d<=4;$d++){
+            if($d!=$c && $d!=$b && $d!=$a){
+
+              for($e=0;$e<=4;$e++){
+                if($e!=$d && $e!=$c && $e!=$b && $e!=$a){
+
+                  // if("$a,$b,$c,$d,$e"==="1,0,2,3,4"){ $printDebug=true; }
+                  // else { $printDebug=false; }
+                  //// echo "$a,$b,$c,$d,$e<br>";
+                  $output = "";
+                  $lastOutput = 0;
+                  foreach(array($a,$b,$c,$d,$e) as $key => $phase){
+                    // echo Intcode($input, $phase);
+                    // echo "Last output: ".$lastOutput."<br>";
+                    $temp = Intcode($input, [$phase, $lastOutput]);
+                    // echo "<hr>";
+                    // $output .= $temp.",";
+                    $output = $temp;
+                    $lastOutput = $temp;
+                    if(!is_numeric($lastOutput)){ 
+                      echo "Trying to do ".'Intcode($input, '.$lastOutput.', '."$phase);"."<br>";
+                      echo "Couldn't continue. lastOutput is not a number: <i>".$lastOutput."</i>";
+                      break;
+                    }
+                    // $debug[] = "Output: ".$temp;
+                    //  $lastOutput = Intcode($input, $lastOutput, $phase);
+                    //  echo $lastOutput.",";
+                    //  $output += $lastOutput;
+                  }
+                // $printDebug=false;
+                  // if($a == 1){ 
+                    // echo $temp;
+                    // break(5); 
+                  // }
+                  echo $temp." ($a,$b,$c,$d,$e)<br>";
+                  if($output > $maxThrust){
+                    $maxThrust = $output;
+                  }
+                  // echo "<br><br>\nDebug: <br>".implode("<br>\n", $debug)."<br>\n"."<hr>";
+                }
+              }
+
+            }
+          }
+
+        }
+      }
+
+    }
+  }
+
+}
+// print_r($out);
+echo "<h1>Max thruster signal: ".$maxThrust."</h1>";
+// 4848201312 : TOO HIGH
+// 43012 : TOO LOW
+
+
+
+?>
\ No newline at end of file