tasks a-s

Task/SEDOLs/PHP/sedols.php

@@ -0,0 +1,26 @@
+function char2value($c) {
+  assert(stripos('AEIOU', $c) === FALSE);
+  return intval($c, 36);
+}
+
+$sedolweight = array(1,3,1,7,3,9);
+
+function checksum($sedol) {
+    global $sedolweight;
+    $tmp = array_sum(array_map(create_function('$ch, $weight', 'return char2value($ch) * $weight;'),
+                               str_split($sedol), $sedolweight)
+                    );
+    return strval((10 - ($tmp % 10)) % 10);
+}
+
+foreach (array('710889',
+               'B0YBKJ',
+               '406566',
+               'B0YBLH',
+               '228276',
+               'B0YBKL',
+               '557910',
+               'B0YBKR',
+               '585284',
+               'B0YBKT') as $sedol)
+    echo $sedol, checksum($sedol), "\n";