Add function to get next strpos of any of a specified set of needles

src/MD_STD.php

@@ -986,4 +986,43 @@ final class MD_STD {
         } . $year . '-' . $month . '-' . $day;
 
     }
+
+    /**
+     * Finds the next occurence of any of a given set of substrings.
+     *
+     * @param string                            $haystack The string to search in.
+     * @param non-empty-array<non-empty-string> $needles  The strings to search for.
+     * @param integer                           $offset   If specified, search will
+     *                                                    start this number of
+     *                                                    characters counted from
+     *                                                    the beginning of the string.
+     *                                                    If the offset is negative,
+     *                                                    the search will start this
+     *                                                    number of characters
+     *                                                    counted from the end of
+     *                                                    the string.
+     *
+     * @return array{position: integer, needle: string}|array{}
+     */
+    public static function strpos_multi(string $haystack, array $needles, int $offset = 0):array {
+
+        $lowest_option = [];
+        foreach ($needles as $needle) {
+
+            if (($pos = strpos($haystack, $needle, $offset)) !== false) {
+
+                if (empty($lowest_option)) {
+                    $lowest_option = ['position' => $pos, 'needle' => $needle];
+                }
+                else if ($pos < $lowest_option['position']) {
+                    $lowest_option = ['position' => $pos, 'needle' => $needle];
+                }
+
+            }
+
+        }
+
+        return $lowest_option;
+
+    }
 }

tests/MD_STD_Test.php

@@ -706,4 +706,41 @@ final class MD_STD_Test extends TestCase {
         self::assertEquals("en", MD_STD::get_user_lang_no_cookie(["de", "en"], "en"));
 
     }
+
+    /**
+     * Data provider for returning a tmp file.
+     *
+     * @return array<string, array{0: non-empty-string, 1: non-empty-array<non-empty-string>, 2: int}>
+     */
+    public static function strpos_multi_provider():array {
+
+        return [
+            "Search quotation markes on when='" => ["when='", ['"', '\''], 5],
+            "Search quotation markes on when=\"" => ["when=\"", ['"', '\''], 5],
+            "Search quotation markes on when=\"'" => ["when=\"'", ['"', '\''], 5],
+            "Search quotation markes on when= (non-existent)" => ["when=", ['"', '\''], -1],
+        ];
+
+    }
+
+    /**
+     * Checks unlink_if_exists works.
+     *
+     * @param non-empty-string                  $haystack Haystack.
+     * @param non-empty-array<non-empty-string> $needles  Needles.
+     * @param integer                           $expected Expected position.
+     *
+     * @return void
+     */
+    #[DataProvider('strpos_multi_provider')]
+    public function test_strpos_multi(string $haystack, array $needles, int $expected):void {
+
+        if ($expected === -1) {
+            self::assertEmpty(MD_STD::strpos_multi($haystack, $needles));
+        }
+        else {
+            self::assertEquals($expected, MD_STD::strpos_multi($haystack, $needles)['position']);
+        }
+
+    }
 }