Initial data commit

Task/Pythagorean-triples/PHP/pythagorean-triples.php

@@ -0,0 +1,37 @@
+<?php
+
+function gcd($a, $b)
+{
+    if ($a == 0)
+       return $b;
+    if ($b == 0)
+       return $a;
+    if($a == $b)
+        return $a;
+    if($a > $b)
+        return gcd($a-$b, $b);
+    return gcd($a, $b-$a);
+}
+
+$pytha = 0;
+$prim = 0;
+$max_p = 100;
+
+for ($a = 1; $a <= $max_p / 3; $a++) {
+    $aa = $a**2;
+    for ($b = $a + 1; $b < $max_p/2; $b++) {
+        $bb = $b**2;
+        for ($c = $b + 1; $c < $max_p/2; $c++) {
+            $cc = $c**2;
+            if ($aa + $bb < $cc) break;
+            if ($a + $b + $c > $max_p) break;
+
+            if ($aa + $bb == $cc) {
+                $pytha++;
+                if (gcd($a, $b) == 1) $prim++;
+            }
+        }
+    }
+}
+
+echo 'Up to ' . $max_p . ', there are ' . $pytha . ' triples, of which ' . $prim . ' are primitive.';