Snippet revisions — Bitbucket

+<?php

+// http://www.bbc.co.uk/programmes/articles/5wkxjTtqRvq8Cyrrjxtk7tc/puzzle-for-today

+$n = [1, 2, 3, 4, 5, 6, 7, 8, 9];

+$s = ['', '+', '-'];

+$co = [];

+for ($i1 = 0; $i1 < 3; $i1++) {

+    for ($i2 = 0; $i2 < 3; $i2++) {

+        for ($i3 = 0; $i3 < 3; $i3++) {

+            for ($i4 = 0; $i4 < 3; $i4++) {

+                for ($i5 = 0; $i5 < 3; $i5++) {

+                    for ($i6 = 0; $i6 < 3; $i6++) {

+                        for ($i7 = 0; $i7 < 3; $i7++) {

+                            for ($i8 = 0; $i8 < 3; $i8++) {

+                                $co[] = [$s[$i1], $s[$i2], $s[$i3], $s[$i4], $s[$i5], $s[$i6], $s[$i7], $s[$i8]];

+                            }

+                        }

+                    }

+                }

+            }

+        }

+    }

+}

+foreach ($co as $c) {

+    $t = $n[0] . $c[0] . $n[1] . $c[1] . $n[2] . $c[2] . $n[3] . $c[3] . $n[4] . $c[4] . $n[5] . $c[5] . $n[6] . $c[6] . $n[7] . $c[7] . $n[8];

+    $to = eval('return ' . $t . ';');

+    if ($to == 100) {

+        echo $t . '=' . $to . PHP_EOL;

+    }

+}

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