Try

Author: VincentLanglet

src/Type/Php/HashFunctionsReturnTypeExtension.php

@@ -30,7 +30,7 @@ final class HashFunctionsReturnTypeExtension implements DynamicFunctionReturnTyp
 	private const SUPPORTED_FUNCTIONS = [
 		'hash' => [
 			'cryptographic' => false,
-			'possiblyFalse' => false,
+			'possiblyFalse' => true,
 			'binary' => 2,
 		],
 		'hash_file' => [
@@ -40,12 +40,12 @@ final class HashFunctionsReturnTypeExtension implements DynamicFunctionReturnTyp
 		],
 		'hash_hkdf' => [
 			'cryptographic' => true,
-			'possiblyFalse' => false,
+			'possiblyFalse' => true,
 			'binary' => true,
 		],
 		'hash_hmac' => [
 			'cryptographic' => true,
-			'possiblyFalse' => false,
+			'possiblyFalse' => true,
 			'binary' => 3,
 		],
 		'hash_hmac_file' => [
@@ -55,7 +55,7 @@ final class HashFunctionsReturnTypeExtension implements DynamicFunctionReturnTyp
 		],
 		'hash_pbkdf2' => [
 			'cryptographic' => true,
-			'possiblyFalse' => false,
+			'possiblyFalse' => true,
 			'binary' => 5,
 		],
 	];
@@ -120,7 +120,7 @@ public function getTypeFromFunctionCall(FunctionReflection $functionReflection,
 		$algorithmType = $scope->getType($functionCall->getArgs()[0]->value);
 		$constantAlgorithmTypes = $algorithmType->getConstantStrings();
 		if (count($constantAlgorithmTypes) === 0) {
-			if ($functionData['possiblyFalse']) {
+			if ($functionData['possiblyFalse'] && !$this->phpVersion->throwsValueErrorForInternalFunctions()) {
 				return TypeUtils::toBenevolentUnion(TypeCombinator::union($stringReturnType, new ConstantBooleanType(false)));
 			}