Added proc_open() stub for param-out

stubs/core.stub

@@ -362,3 +362,18 @@ function header_register_callback(callable $callback): bool {}
  * @param-later-invoked-callable $callback
  */
 function register_tick_function(callable $callback, mixed ...$args): bool {}
+
+/**
+ * @template P of int
+ *
+ * @param string|list<string> $command
+ * @param array<P, list<string>|resource> $descriptor_spec
+ * @param mixed $pipes
+ * @param null|array<string, mixed> $env_vars
+ * @param null|array<string, bool> $options
+ *
+ * @param-out array<P, resource> $pipes
+ *
+ * @return resource|false
+ */
+function proc_open($command, array $descriptor_spec, &$pipes, ?string $cwd, ?array $env_vars, ?array $options) {}

tests/PHPStan/Analyser/nsrt/bug-13197.php

@@ -0,0 +1,42 @@
+<?php declare(strict_types = 1);
+
+namespace Bug13197;
+
+use function PHPStan\Testing\assertType;
+
+/**
+ * @return array{string, string}|null STDOUT & STDERR tuple
+ */
+function execute(string $command): ?array
+{
+	if (!function_exists('proc_open')) {
+		return null;
+	}
+
+	$pipes = [];
+
+	$process = @proc_open(
+		$command,
+		[
+			['pipe', 'rb'],
+			['pipe', 'wb'], // stdout
+			['pipe', 'wb'], // stderr
+		],
+		$pipes
+	);
+
+	assertType('array<0|1|2, resource>', $pipes);
+
+	if (!is_resource($process)) {
+		return null;
+	}
+
+	fclose($pipes[0]);
+
+	$stdout = (string) stream_get_contents($pipes[1]);
+	$stderr = (string) stream_get_contents($pipes[2]);
+
+	proc_close($process);
+
+	return [$stdout, $stderr];
+}

tests/PHPStan/Analyser/nsrt/bug-13197b.php

@@ -0,0 +1,26 @@
+<?php declare(strict_types = 1);
+
+namespace Bug13197b;
+
+use function PHPStan\Testing\assertType;
+
+function execute(string $command): void
+{
+	if (!function_exists('proc_open')) {
+		return;
+	}
+
+	$pipes = [];
+
+	$process = @proc_open(
+		$command,
+		[
+			['pipe', 'rb'],
+			3 => ['pipe', 'wb'], // stdout
+			5 => ['pipe', 'wb'], // stderr
+		],
+		$pipes
+	);
+
+	assertType('array<0|3|5, resource>', $pipes);
+}

tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php

@@ -2216,4 +2216,11 @@ public function testBug12317(): void
 		]);
 	}
 
+	public function testBug13197(): void
+	{
+		$this->checkExplicitMixed = true;
+		$this->checkImplicitMixed = true;
+		$this->analyse([__DIR__ . '/../../Analyser/nsrt/bug-13197.php'], []);
+	}
+
 }