Add more nullsafe operators

Author: nicolas-grekas

AbstractString.php

@@ -74,7 +74,7 @@ public static function wrap(array $values): array
 
         foreach ($values as $k => $v) {
             if (\is_string($k) && '' !== $k && $k !== $j = (string) new static($k)) {
-                $keys = $keys ?? array_keys($values);
+                $keys ??= array_keys($values);
                 $keys[$i] = $j;
             }
 

ByteString.php

@@ -48,7 +48,7 @@ public static function fromRandom(int $length = 16, string $alphabet = null): se
             throw new InvalidArgumentException(sprintf('A strictly positive length is expected, "%d" given.', $length));
         }
 
-        $alphabet = $alphabet ?? self::ALPHABET_ALPHANUMERIC;
+        $alphabet ??= self::ALPHABET_ALPHANUMERIC;
         $alphabetSize = \strlen($alphabet);
         $bits = (int) ceil(log($alphabetSize, 2.0));
         if ($bits <= 0 || $bits > 56) {
@@ -363,7 +363,7 @@ public function splice(string $replacement, int $start = 0, int $length = null):
 
     public function split(string $delimiter, int $limit = null, int $flags = null): array
     {
-        if (1 > $limit = $limit ?? \PHP_INT_MAX) {
+        if (1 > $limit ??= \PHP_INT_MAX) {
             throw new InvalidArgumentException('Split limit must be a positive integer.');
         }
 

CodePointString.php

@@ -210,7 +210,7 @@ public function splice(string $replacement, int $start = 0, int $length = null):
 
     public function split(string $delimiter, int $limit = null, int $flags = null): array
     {
-        if (1 > $limit = $limit ?? \PHP_INT_MAX) {
+        if (1 > $limit ??= \PHP_INT_MAX) {
             throw new InvalidArgumentException('Split limit must be a positive integer.');
         }
 

Resources/functions.php

@@ -31,7 +31,7 @@ function b(?string $string = ''): ByteString
      */
     function s(?string $string = ''): AbstractString
     {
-        $string = $string ?? '';
+        $string ??= '';
 
         return preg_match('//u', $string) ? new UnicodeString($string) : new ByteString($string);
     }

Slugger/AsciiSlugger.php

@@ -93,7 +93,7 @@ public function getLocale(): string
      */
     public function slug(string $string, string $separator = '-', string $locale = null): AbstractUnicodeString
     {
-        $locale = $locale ?? $this->defaultLocale;
+        $locale ??= $this->defaultLocale;
 
         $transliterator = [];
         if ($locale && ('de' === $locale || str_starts_with($locale, 'de_'))) {

UnicodeString.php

@@ -280,7 +280,7 @@ public function splice(string $replacement, int $start = 0, int $length = null):
 
     public function split(string $delimiter, int $limit = null, int $flags = null): array
     {
-        if (1 > $limit = $limit ?? 2147483647) {
+        if (1 > $limit ??= 2147483647) {
             throw new InvalidArgumentException('Split limit must be a positive integer.');
         }