diff --git a/resources/functionMap_php80delta.php b/resources/functionMap_php80delta.php
index e17864ac5c..bba7c29015 100644
--- a/resources/functionMap_php80delta.php
+++ b/resources/functionMap_php80delta.php
@@ -193,6 +193,7 @@
 		'imagejpeg\'1' => ['string|false', 'im'=>'resource', 'filename='=>'null', 'quality='=>'int'],
 		'imagerotate' => ['resource|false', 'src_im'=>'resource', 'angle'=>'float', 'bgdcolor'=>'int', 'ignoretransparent='=>'int'],
 		'imagescale' => ['resource|false', 'im'=>'resource', 'new_width'=>'int', 'new_height='=>'int', 'method='=>'int'],
+		'implode\'1' => ['string', 'pieces'=>'array'],
 		'jpeg2wbmp' => ['bool', 'jpegname'=>'string', 'wbmpname'=>'string', 'dest_height'=>'int', 'dest_width'=>'int', 'threshold'=>'int'],
 		'ldap_sort' => ['bool', 'link_identifier'=>'resource', 'result_identifier'=>'resource', 'sortfilter'=>'string'],
 		'mb_decode_numericentity' => ['string|false', 'string'=>'string', 'convmap'=>'array', 'encoding='=>'string', 'is_hex='=>'bool'],
diff --git a/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php b/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php
index 6ca8c091c2..1d673de6c9 100644
--- a/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php
+++ b/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php
@@ -313,6 +313,14 @@ public function testImplodeOnPhp74(): void
 		if (PHP_VERSION_ID < 70400) {
 			$errors = [];
 		}
+		if (PHP_VERSION_ID >= 80000) {
+			$errors = [
+				[
+					'Parameter #2 $array of function implode expects array, string given.',
+					8,
+				],
+			];
+		}
 
 		$this->analyse([__DIR__ . '/data/implode-74.php'], $errors);
 	}
diff --git a/tests/PHPStan/Rules/Functions/data/number-format-named-arguments.php b/tests/PHPStan/Rules/Functions/data/number-format-named-arguments.php
index 866c4b34ab..fea39c2ad1 100644
--- a/tests/PHPStan/Rules/Functions/data/number-format-named-arguments.php
+++ b/tests/PHPStan/Rules/Functions/data/number-format-named-arguments.php
@@ -1,3 +1,5 @@
 <?php declare(strict_types = 1); // lint >= 8.0
 
 \number_format(200.00, decimals: 2, decimal_separator: ',', thousands_separator: '&nbsp;');
+
+$name = implode(separator: ' ', array: ['John', 'Doe']);