Data commit

Task/Population-count/PHP/population-count.php

@@ -0,0 +1,68 @@
+function convertToBinary($integer) {
+    $binary = "";
+
+    do {
+        $quotient = (int) ($integer / 2);
+        $binary .= $integer % 2;
+        $integer = $quotient;
+    } while ($quotient > 0);
+
+    return $binary;
+}
+
+function getPopCount($integer) {
+    $binary = convertToBinary($integer);
+    $offset = 0;
+    $popCount = 0;
+
+    do {
+        $pos = strpos($binary, "1", $offset);
+        if($pos !== FALSE) $popCount++;
+        $offset = $pos + 1;
+    } while ($pos !== FALSE);
+
+    return $popCount;
+}
+
+function print3PowPopCounts() {
+    for ($p = 0; $p < 30; $p++) {
+        echo " " . getPopCount(3 ** $p);
+    }
+}
+
+function printFirst30Evil() {
+    $counter = 0;
+    $pops = 0;
+
+    while ($pops < 30) {
+        $popCount = getPopCount($counter);
+        if ($popCount % 2 == 0)  {
+            echo " " . $counter;
+            $pops++;
+        }
+        $counter++;
+    }
+}
+
+function printFirst30Odious() {
+    $counter = 1;
+    $pops = 0;
+
+    while ($pops < 30) {
+        $popCount = getPopCount($counter);
+        if ($popCount % 2 != 0)  {
+            echo " " . $counter;
+            $pops++;
+        }
+        $counter++;
+    }
+}
+
+echo "3 ^ x pop counts:";
+print3PowPopCounts();
+
+echo "\nfirst 30 evil numbers:";
+printFirst30Evil();
+
+echo "\nfirst 30 odious numbers:";
+printFirst30Odious();