Added PHP solution to problem 8.

DrkSephy · May 8, 2014 · 9235cfb · 9235cfb
1 parent f024317
commit 9235cfb
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/php/p8_kevin.php b/php/p8_kevin.php
@@ -0,0 +1,20 @@
+<?php
+
+/*  Problem 8: Largest product in a series
+ *  -----
+ *  Find the greatest product of five consecutive digits in the 1000-digit number.
+ */
+
+// For convenience, store the number as a string.
+$n = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";
+
+$g = 0;
+for($i = 0; $i < strlen($n) - 5; $i++) {
+    $p = array_product(str_split(substr($n, $i, 5)));
+    if($p > $g)
+        $g = $p;
+}
+
+echo $g;
+
+?>