Update password function types for PHP 7.4 (#2396)

* Support NULL predefined constants

* Fix #2395 - update password_hash() and password_needs_rehash() types for PHP 7.4

* Change $fq_const_name check so it still uses isset

src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/ConstFetchAnalyzer.php

@@ -17,6 +17,7 @@
 use Psalm\Issue\UndefinedConstant;
 use Psalm\IssueBuffer;
 use Psalm\Type;
+use function array_key_exists;
 use function implode;
 use function strtolower;
 use function explode;
@@ -102,7 +103,7 @@ public static function getGlobalConstType(
 
         $predefined_constants = $codebase->config->getPredefinedConstants();
 
-        if (isset($predefined_constants[$fq_const_name])
+        if (($fq_const_name && isset($predefined_constants[$fq_const_name]))
             || isset($predefined_constants[$const_name])
         ) {
             switch ($const_name) {

src/Psalm/Internal/CallMap.php

@@ -9356,9 +9356,9 @@
 'parsekit_func_arginfo' => ['array', 'function'=>'mixed'],
 'passthru' => ['void', 'command'=>'string', '&w_return_value='=>'int'],
 'password_get_info' => ['array', 'hash'=>'string'],
-'password_hash' => ['string|false|null', 'password'=>'string', 'algo'=>'int', 'options='=>'array'],
+'password_hash' => ['string|null', 'password'=>'string', 'algo'=>'int|string|null', 'options='=>'array'],
 'password_make_salt' => ['bool', 'password'=>'string', 'hash'=>'string'],
-'password_needs_rehash' => ['bool', 'hash'=>'string', 'algo'=>'int', 'options='=>'array'],
+'password_needs_rehash' => ['bool', 'hash'=>'string', 'algo'=>'int|string|null', 'options='=>'array'],
 'password_verify' => ['bool', 'password'=>'string', 'hash'=>'string'],
 'pathinfo' => ['array|string', 'path'=>'string', 'options='=>'int'],
 'pclose' => ['int', 'fp'=>'resource'],

src/Psalm/Internal/CallMap_74_delta.php

@@ -15,9 +15,11 @@
  */
 return [
 'new' => [
-    'password_hash' => ['string|null', 'password'=>'string', 'algo'=>'int', 'options='=>'array'],
+    'password_hash' => ['string|null', 'password'=>'string', 'algo'=>'int|string|null', 'options='=>'array'],
+    'password_needs_rehash' => ['bool', 'hash'=>'string', 'algo'=>'int|string|null', 'options='=>'array'],
 ],
 'old' => [
     'password_hash' => ['string|false', 'password'=>'string', 'algo'=>'int', 'options='=>'array'],
+    'password_needs_rehash' => ['bool', 'hash'=>'string', 'algo'=>'int', 'options='=>'array'],
 ]
 ];