More solutions

ProjectEuler/032/solve.php

@@ -0,0 +1,23 @@
+<?php
+
+function pandigital($number) {
+    $array = count_chars($number,1);
+    ksort($array);
+    if($array == array(49=>1,50=>1,51=>1,52=>1,53=>1,54=>1,55=>1,56=>1,57=>1)) { return true;} else { return false; }
+}
+
+$products = [];
+for($a = 1; $a <= 2500; $a++) {
+    for($b = 1; $b <= 2500; $b++) {
+        $p = $a*$b;
+        $str = (string)$a.$b.$p;
+        if(strlen($str) == 9 && pandigital($str))
+        {
+            $products[] = $p; 
+            echo "Found $a*$b=$p\n";
+        }
+    }
+}
+
+$products = array_unique($products);
+echo array_sum($products).PHP_EOL;

ProjectEuler/037/solve.php

@@ -0,0 +1,33 @@
+<?php
+
+$count = 0;
+$sum = 0;
+function is_prime(int $n) :bool{for($i=$n**.5|1;$i&&$n%$i--;);return!$i&&$n>1;}
+
+for ($prime = 11; $count < 11; $prime += 2) {
+    if (is_prime($prime)) {
+        //echo "Testing $prime\n";
+        for ($c = 1; $c < strlen($prime); $c++) {
+            $left = substr($prime, -$c);
+            //echo "Trimmed left $left\n";
+            if (!is_prime($left)) {
+                //echo "Not prime $left\n";
+                continue 2;
+            }
+        }
+
+        for ($c = 1; $c < strlen($prime); $c++) {
+            $right = substr($prime, 0, $c);
+            //echo "Trimmed right $right\n";
+            if (!is_prime($right)) {
+                //echo "Not prime $right\n";
+                continue 2;
+            }
+        }
+        $sum += $prime;
+        $count++;
+        echo "found $prime\n";
+    }
+}
+
+echo "Total sum: $sum\n";

ProjectEuler/043/solve.php

@@ -0,0 +1,38 @@
+<?php
+
+function pandigital($number)
+{
+    $array = count_chars($number, 1);
+    ksort($array);
+    if ($array == array(48=> 1, 49 => 1, 50 => 1, 51 => 1, 52 => 1, 53 => 1, 54 => 1, 55 => 1, 56 => 1, 57 => 1)) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+$sum = 0;
+for ($i = 1023456789; $i < 9876543210; $i++) {
+//$i = 1406357289;
+    if (substr($i, 7, 3) % 17 == 0) {
+        if (substr($i, 6, 3) % 13 == 0) {
+            if (substr($i, 5, 3) % 11 == 0) {
+                if (substr($i, 4, 3) % 7 == 0) {
+                    if (substr($i, 3, 3) % 5 == 0) {
+                        if (substr($i, 2, 3) % 3 == 0) {
+                            if (substr($i, 1, 3) % 2 == 0) {
+                                    echo "Close $i\n";
+                                if (pandigital($i)) {
+                                    echo "Found: $i\n";
+                                    $sum += $i;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+   }
+}
+
+echo "Sum: $sum\n";