diff --git a/bin/functionMetadata_original.php b/bin/functionMetadata_original.php
index 17be4631a9..50ba6b3ab4 100644
--- a/bin/functionMetadata_original.php
+++ b/bin/functionMetadata_original.php
@@ -18,6 +18,7 @@
 	'array_diff_ukey' => ['hasSideEffects' => false],
 	'array_fill' => ['hasSideEffects' => false],
 	'array_fill_keys' => ['hasSideEffects' => false],
+	'array_filter' => ['hasSideEffects' => false],
 	'array_flip' => ['hasSideEffects' => false],
 	'array_intersect' => ['hasSideEffects' => false],
 	'array_intersect_assoc' => ['hasSideEffects' => false],
@@ -28,6 +29,7 @@
 	'array_key_last' => ['hasSideEffects' => false],
 	'array_key_exists' => ['hasSideEffects' => false],
 	'array_keys' => ['hasSideEffects' => false],
+	'array_map' => ['hasSideEffects' => false],
 	'array_merge' => ['hasSideEffects' => false],
 	'array_merge_recursive' => ['hasSideEffects' => false],
 	'array_pad' => ['hasSideEffects' => false],
@@ -35,6 +37,7 @@
 	'array_product' => ['hasSideEffects' => false],
 	'array_push' => ['hasSideEffects' => true],
 	'array_rand' => ['hasSideEffects' => false],
+	'array_reduce' => ['hasSideEffects' => false],
 	'array_replace' => ['hasSideEffects' => false],
 	'array_replace_recursive' => ['hasSideEffects' => false],
 	'array_reverse' => ['hasSideEffects' => false],
diff --git a/resources/functionMetadata.php b/resources/functionMetadata.php
index a01a7181a6..6dd24442d8 100644
--- a/resources/functionMetadata.php
+++ b/resources/functionMetadata.php
@@ -724,6 +724,7 @@
 	'array_diff_ukey' => ['hasSideEffects' => false],
 	'array_fill' => ['hasSideEffects' => false],
 	'array_fill_keys' => ['hasSideEffects' => false],
+	'array_filter' => ['hasSideEffects' => false],
 	'array_first' => ['hasSideEffects' => false],
 	'array_flip' => ['hasSideEffects' => false],
 	'array_intersect' => ['hasSideEffects' => false],
@@ -737,6 +738,7 @@
 	'array_key_last' => ['hasSideEffects' => false],
 	'array_keys' => ['hasSideEffects' => false],
 	'array_last' => ['hasSideEffects' => false],
+	'array_map' => ['hasSideEffects' => false],
 	'array_merge' => ['hasSideEffects' => false],
 	'array_merge_recursive' => ['hasSideEffects' => false],
 	'array_pad' => ['hasSideEffects' => false],
@@ -744,6 +746,7 @@
 	'array_product' => ['hasSideEffects' => false],
 	'array_push' => ['hasSideEffects' => true],
 	'array_rand' => ['hasSideEffects' => false],
+	'array_reduce' => ['hasSideEffects' => false],
 	'array_replace' => ['hasSideEffects' => false],
 	'array_replace_recursive' => ['hasSideEffects' => false],
 	'array_reverse' => ['hasSideEffects' => false],
diff --git a/tests/PHPStan/Command/data/file-without-errors.php b/tests/PHPStan/Command/data/file-without-errors.php
index 08929907d3..c6d0a42c3a 100644
--- a/tests/PHPStan/Command/data/file-without-errors.php
+++ b/tests/PHPStan/Command/data/file-without-errors.php
@@ -1,3 +1,3 @@
 <?php
 
-array_filter([0, 1, 2]);
+$a = array_filter([0, 1, 2]);
diff --git a/tests/PHPStan/Rules/Functions/CallToFunctionStatementWithoutSideEffectsRuleTest.php b/tests/PHPStan/Rules/Functions/CallToFunctionStatementWithoutSideEffectsRuleTest.php
index bc10f220eb..057ee275b4 100644
--- a/tests/PHPStan/Rules/Functions/CallToFunctionStatementWithoutSideEffectsRuleTest.php
+++ b/tests/PHPStan/Rules/Functions/CallToFunctionStatementWithoutSideEffectsRuleTest.php
@@ -119,6 +119,52 @@ public function testFirstClassCallables(): void
 		]);
 	}
 
+	public function testBug3770(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-3770.php'], [
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				8,
+			],
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				15,
+			],
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				23,
+			],
+		]);
+	}
+
+	public function testBug11317(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-11317.php'], [
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				12,
+			],
+		]);
+	}
+
+	public function testBug11101(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-11101.php'], [
+			[
+				'Call to function array_filter() on a separate line has no effect.',
+				11,
+			],
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				12,
+			],
+			[
+				'Call to function array_reduce() on a separate line has no effect.',
+				13,
+			],
+		]);
+	}
+
 	#[RequiresPhp('>= 8.5')]
 	public function testPipeOperator(): void
 	{
diff --git a/tests/PHPStan/Rules/Functions/data/bug-11101.php b/tests/PHPStan/Rules/Functions/data/bug-11101.php
new file mode 100644
index 0000000000..161714aa0a
--- /dev/null
+++ b/tests/PHPStan/Rules/Functions/data/bug-11101.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Bug11101;
+
+/**
+ * @param array<mixed> $array
+ */
+function doFoo(array $array): void
+{
+	// These should all be reported as having no effect
+	array_filter($array, 'is_string'); // line 11
+	array_map('is_string', $array); // line 12
+	array_reduce($array, function ($carry, $item) { // line 13
+		return $carry + $item;
+	}, 0);
+
+	// These are fine - using the return value
+	$a = array_filter($array, 'is_string');
+	$b = array_map('is_string', $array);
+	$c = array_reduce($array, function ($carry, $item) {
+		return $carry + $item;
+	}, 0);
+}
diff --git a/tests/PHPStan/Rules/Functions/data/bug-11317.php b/tests/PHPStan/Rules/Functions/data/bug-11317.php
new file mode 100644
index 0000000000..be633f78ee
--- /dev/null
+++ b/tests/PHPStan/Rules/Functions/data/bug-11317.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types = 1);
+
+namespace Bug11317;
+
+class HelloWorld
+{
+	/**
+	 * @param array<int> $a
+	 */
+	public function sayHello(array $a): void
+	{
+		array_map(function ($i) {
+			return $i;
+		}, $a);
+	}
+}
diff --git a/tests/PHPStan/Rules/Functions/data/bug-3770.php b/tests/PHPStan/Rules/Functions/data/bug-3770.php
new file mode 100644
index 0000000000..c5781f5a34
--- /dev/null
+++ b/tests/PHPStan/Rules/Functions/data/bug-3770.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Bug3770;
+
+/** @var array<int, int> $numbers */
+$numbers = [];
+
+array_map(
+	function ($value) {
+		return $value;
+	},
+	$numbers,
+);
+
+array_map(
+	/** @param 1|2|3 $value */
+	function ($value) {
+		return $value;
+	},
+	$numbers,
+);
+
+array_map(
+	/** @param 1|2|3 $value */
+	fn($value) => $value,
+	$numbers,
+);
diff --git a/tests/PHPStan/Rules/Pure/PureMethodRuleTest.php b/tests/PHPStan/Rules/Pure/PureMethodRuleTest.php
index 0aa586868e..c8464ee419 100644
--- a/tests/PHPStan/Rules/Pure/PureMethodRuleTest.php
+++ b/tests/PHPStan/Rules/Pure/PureMethodRuleTest.php
@@ -279,6 +279,12 @@ public function testAllMethodsArePure(): void
 		]);
 	}
 
+	public function testBug11100(): void
+	{
+		$this->treatPhpDocTypesAsCertain = true;
+		$this->analyse([__DIR__ . '/data/bug-11100.php'], []);
+	}
+
 	public function testBug12382(): void
 	{
 		$this->treatPhpDocTypesAsCertain = true;
diff --git a/tests/PHPStan/Rules/Pure/data/bug-11100.php b/tests/PHPStan/Rules/Pure/data/bug-11100.php
new file mode 100644
index 0000000000..a0e3f5f384
--- /dev/null
+++ b/tests/PHPStan/Rules/Pure/data/bug-11100.php
@@ -0,0 +1,30 @@
+<?php // lint >= 8.0
+
+namespace Bug11100;
+
+final class FooClass
+{
+	/**
+	 * @param array<string, string|int> $getParams
+	 *
+	 * @phpstan-pure
+	 */
+	public function build(array $getParams, string $trailingSlash, bool $useSlashSeparator): string
+	{
+		if ($getParams === []) {
+			return '';
+		}
+
+		if ($useSlashSeparator) {
+			return '/' . implode('/', array_map(
+				static function (string $key, string|int $value): string {
+					return rawurlencode($key) . '/' . rawurlencode((string) $value);
+				},
+				array_keys($getParams),
+				$getParams
+			)) . $trailingSlash;
+		}
+
+		return $trailingSlash . '?' . http_build_query($getParams);
+	}
+}