Specify PHP 7.1 requirement

composer.json

@@ -13,7 +13,7 @@
 
     ],
     "require": {
-        "php": "^7.0"
+        "php": "^7.1"
     },
     "require-dev": {
         "ext-intl": "*",

lib/Encoding/AbstractEncoding.php

@@ -51,7 +51,7 @@ abstract class AbstractEncoding implements Encoding {
         return $this->posChar;
     }
 
-    public function rewind() {
+    public function rewind(): void {
         $this->posByte = 0;
         $this->posChar = 0;
         $this->errMark = -1;
@@ -163,7 +163,7 @@ abstract class AbstractEncoding implements Encoding {
     }
 
     /** Sets the decoder's state to the values specified */
-    protected function stateApply(array $state) {
+    protected function stateApply(array $state): void {
         while (sizeof($this->errStack) > $state['errCount']) {
             list($this->errMark, $this->errSync) = array_pop($this->errStack);
         }
@@ -174,8 +174,7 @@ abstract class AbstractEncoding implements Encoding {
     }
 
     /** Handles decoding errors */
-    protected function errDec(int $mode, int $charOffset, int $byteOffset) {
-        assert(in_array($mode, [self::MODE_NULL, self::MODE_REPLACE, self::MODE_FATAL]), "Invalid error mode $mode");
+    protected function errDec(int $mode, int $charOffset, int $byteOffset): ?int {
         if ($mode !== self::MODE_NULL) {
             // expose the error to the user; this disambiguates a literal replacement character
             $this->posErr = $this->posChar;
@@ -195,7 +194,7 @@ abstract class AbstractEncoding implements Encoding {
     }
 
     /** Handles encoding errors */
-    protected static function errEnc(bool $htmlMode, $data = null) {
+    protected static function errEnc(bool $htmlMode, $data = null): string {
         if ($htmlMode) {
             return "&#".(string) $data.";";
         } else {

lib/Encoding/Encoding.php

@@ -54,7 +54,7 @@ interface Encoding {
      *
      * This is usually faster than using the seek method for the same purpose
      */
-    public function rewind();
+    public function rewind(): void;
 
     /** Retrieves the next $num characters (in UTF-8 encoding) from the string without advancing the character pointer
      *

lib/Encoding/ISO2022JP.php

@@ -178,7 +178,7 @@ class ISO2022JP extends AbstractEncoding implements Encoding {
         return $out;
     }
 
-    protected function stateApply(array $state) {
+    protected function stateApply(array $state): void {
         while (sizeof($this->modeStack) > $state['modeCount']) {
             list($this->modeMark, $this->mode) = array_pop($this->modeStack);
         }
@@ -186,7 +186,7 @@ class ISO2022JP extends AbstractEncoding implements Encoding {
         parent::stateApply($state);
     }
 
-    public function rewind() {
+    public function rewind(): void {
         $this->modeStack = [];
         $this->modeMark = \PHP_INT_MIN;
         $this->mode = self::ASCII_STATE;

lib/Encoding/Replacement.php

@@ -75,7 +75,7 @@ class Replacement implements Encoding {
         return $distance;
     }
 
-    public function rewind() {
+    public function rewind(): void {
         $this->done = false;
     }