diff --git a/generated/exec.php b/generated/exec.php
index 83121e7d..c4dd4911 100644
--- a/generated/exec.php
+++ b/generated/exec.php
@@ -43,6 +43,35 @@ function exec(string $command, ?array &$output = null, ?int &$result_code = null
 }
 
 
+/**
+ * The passthru function is similar to the
+ * exec function in that it executes a
+ * command. This function
+ * should be used in place of exec or
+ * system when the output from the Unix command
+ * is binary data which needs to be passed directly back to the
+ * browser.  A common use for this is to execute something like the
+ * pbmplus utilities that can output an image stream directly.  By
+ * setting the Content-type to image/gif and
+ * then calling a pbmplus program to output a gif, you can create
+ * PHP scripts that output images directly.
+ *
+ * @param string $command The command that will be executed.
+ * @param int|null $result_code If the result_code argument is present, the
+ * return status of the Unix command will be placed here.
+ * @throws ExecException
+ *
+ */
+function passthru(string $command, ?int &$result_code = null): void
+{
+    error_clear_last();
+    $result = \passthru($command, $result_code);
+    if ($result === false) {
+        throw ExecException::createFromPhpError();
+    }
+}
+
+
 /**
  * proc_nice changes the priority of the current
  * process by the amount specified in priority. A
diff --git a/generated/filesystem.php b/generated/filesystem.php
index 33891f83..833719b6 100644
--- a/generated/filesystem.php
+++ b/generated/filesystem.php
@@ -235,7 +235,7 @@ function fflush($stream): void
  * @param resource $stream A valid file pointer to a file successfully opened by
  * fopen, popen, or
  * fsockopen.
- * @param \0|int $length Must be greater than the longest line (in characters) to be found in
+ * @param int $length Must be greater than the longest line (in characters) to be found in
  * the CSV file (allowing for trailing line-end characters). Otherwise the
  * line is split in chunks of length characters,
  * unless the split would occur inside an enclosure.
@@ -251,7 +251,7 @@ function fflush($stream): void
  * @throws FilesystemException
  *
  */
-function fgetcsv($stream, $length = null, string $separator = ",", string $enclosure = "\"", string $escape = "\\")
+function fgetcsv($stream, int $length = null, string $separator = ",", string $enclosure = "\"", string $escape = "\\")
 {
     error_clear_last();
     if ($escape !== "\\") {
@@ -299,14 +299,14 @@ function fgetcsv($stream, $length = null, string $separator = ",", string $enclo
  * Seeking (offset) is not supported with remote files.
  * Attempting to seek on non-local files may work with small offsets, but this
  * is unpredictable because it works on the buffered stream.
- * @param \0|int $length Maximum length of data read. The default is to read until end
+ * @param int $length Maximum length of data read. The default is to read until end
  * of file is reached. Note that this parameter is applied to the
  * stream processed by the filters.
  * @return string The function returns the read data.
  * @throws FilesystemException
  *
  */
-function file_get_contents(string $filename, bool $use_include_path = false, $context = null, int $offset = 0, $length = null): string
+function file_get_contents(string $filename, bool $use_include_path = false, $context = null, int $offset = 0, int $length = null): string
 {
     error_clear_last();
     if ($length !== null) {
@@ -395,11 +395,11 @@ function file_get_contents(string $filename, bool $use_include_path = false, $co
  *
  * @param resource|null $context A valid context resource created with
  * stream_context_create.
- * @return \0|int This function returns the number of bytes that were written to the file.
+ * @return int This function returns the number of bytes that were written to the file.
  * @throws FilesystemException
  *
  */
-function file_put_contents(string $filename, $data, int $flags = 0, $context = null)
+function file_put_contents(string $filename, $data, int $flags = 0, $context = null): int
 {
     error_clear_last();
     if ($context !== null) {
@@ -613,12 +613,12 @@ function fileperms(string $filename): int
  * Gets the size for the given file.
  *
  * @param string $filename Path to the file.
- * @return \0|int Returns the size of the file in bytes, or FALSE (and generates an error
+ * @return int Returns the size of the file in bytes, or FALSE (and generates an error
  * of level E_WARNING) in case of an error.
  * @throws FilesystemException
  *
  */
-function filesize(string $filename)
+function filesize(string $filename): int
 {
     error_clear_last();
     $result = \filesize($filename);
@@ -929,12 +929,12 @@ function fopen(string $filename, string $mode, bool $use_include_path = false, $
  *
  * @param resource $stream A file system pointer resource
  * that is typically created using fopen.
- * @param \0|int $length Up to length number of bytes read.
+ * @param int $length Up to length number of bytes read.
  * @return string Returns the read string.
  * @throws FilesystemException
  *
  */
-function fread($stream, $length): string
+function fread($stream, int $length): string
 {
     error_clear_last();
     $result = \fread($stream, $length);
@@ -998,7 +998,7 @@ function fsync($stream): void
  * @param resource $stream The file pointer.
  *
  * The stream must be open for writing.
- * @param \0|int $size The size to truncate to.
+ * @param int $size The size to truncate to.
  *
  * If size is larger than the file then the file
  * is extended with null bytes.
@@ -1008,7 +1008,7 @@ function fsync($stream): void
  * @throws FilesystemException
  *
  */
-function ftruncate($stream, $size): void
+function ftruncate($stream, int $size): void
 {
     error_clear_last();
     $result = \ftruncate($stream, $size);
@@ -1024,14 +1024,14 @@ function ftruncate($stream, $size): void
  * @param resource $stream A file system pointer resource
  * that is typically created using fopen.
  * @param string $data The string that is to be written.
- * @param \0|int $length If length is an integer, writing will stop
+ * @param int $length If length is an integer, writing will stop
  * after length bytes have been written or the
  * end of data is reached, whichever comes first.
- * @return \0|int
+ * @return int
  * @throws FilesystemException
  *
  */
-function fwrite($stream, string $data, $length = null)
+function fwrite($stream, string $data, int $length = null): int
 {
     error_clear_last();
     if ($length !== null) {
@@ -1356,11 +1356,11 @@ function parse_ini_string(string $ini_string, bool $process_sections = false, in
  * you want to search for the file in the include_path, too.
  * @param resource $context A context stream
  * resource.
- * @return \0|int Returns the number of bytes read from the file on success
+ * @return int Returns the number of bytes read from the file on success
  * @throws FilesystemException
  *
  */
-function readfile(string $filename, bool $use_include_path = false, $context = null)
+function readfile(string $filename, bool $use_include_path = false, $context = null): int
 {
     error_clear_last();
     if ($context !== null) {
diff --git a/generated/functionsList.php b/generated/functionsList.php
index f5970b52..bf152651 100644
--- a/generated/functionsList.php
+++ b/generated/functionsList.php
@@ -693,6 +693,7 @@
     'parse_ini_file',
     'parse_ini_string',
     'parse_url',
+    'passthru',
     'pcntl_getpriority',
     'pcntl_setpriority',
     'pcntl_signal',
diff --git a/generated/openssl.php b/generated/openssl.php
index f2ddda34..1c5b875d 100644
--- a/generated/openssl.php
+++ b/generated/openssl.php
@@ -1353,12 +1353,12 @@ function openssl_spki_verify(string $spki): void
  * @param int|string $algorithm int - one of these Signature Algorithms.
  *
  * string - a valid string returned by openssl_get_md_methods example, "sha1WithRSAEncryption" or "sha512".
- * @return \-1|\0|\1 Returns 1 if the signature is correct, 0 if it is incorrect, and
+ * @return int Returns 1 if the signature is correct, 0 if it is incorrect, and
  * -1.
  * @throws OpensslException
  *
  */
-function openssl_verify(string $data, string $signature, $public_key, $algorithm = OPENSSL_ALGO_SHA1)
+function openssl_verify(string $data, string $signature, $public_key, $algorithm = OPENSSL_ALGO_SHA1): int
 {
     error_clear_last();
     $result = \openssl_verify($data, $signature, $public_key, $algorithm);
diff --git a/generated/pcre.php b/generated/pcre.php
index e3ebc582..4ebb9839 100644
--- a/generated/pcre.php
+++ b/generated/pcre.php
@@ -369,11 +369,11 @@ function preg_grep(string $pattern, array $array, int $flags = 0): array
  *
  *
  * The above example will output:
- * @return \0|int|null Returns the number of full pattern matches (which might be zero).
+ * @return int|null Returns the number of full pattern matches (which might be zero).
  * @throws PcreException
  *
  */
-function preg_match_all(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0)
+function preg_match_all(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): ?int
 {
     error_clear_last();
     $result = \preg_match_all($pattern, $subject, $matches, $flags, $offset);
diff --git a/generated/zlib.php b/generated/zlib.php
index 92d198d2..39dc8985 100644
--- a/generated/zlib.php
+++ b/generated/zlib.php
@@ -686,11 +686,11 @@ function inflate_init(int $encoding, array $options = [])
  * contents written to standard output.
  * @param int $use_include_path You can set this optional parameter to 1, if you
  * want to search for the file in the include_path too.
- * @return \0|int Returns the number of (uncompressed) bytes read from the file on success
+ * @return int Returns the number of (uncompressed) bytes read from the file on success
  * @throws ZlibException
  *
  */
-function readgzfile(string $filename, int $use_include_path = 0)
+function readgzfile(string $filename, int $use_include_path = 0): int
 {
     error_clear_last();
     $result = \readgzfile($filename, $use_include_path);
diff --git a/generator/src/PhpStanFunctions/PhpStanType.php b/generator/src/PhpStanFunctions/PhpStanType.php
index 88e5e700..bf0e8fdb 100644
--- a/generator/src/PhpStanFunctions/PhpStanType.php
+++ b/generator/src/PhpStanFunctions/PhpStanType.php
@@ -78,13 +78,15 @@ public function __construct(string $data, bool $writeOnly = false)
                 $returnType = 'string';
             } elseif ($returnType === 'positive-int') {
                 $returnType = 'int';
+            } elseif (is_numeric($returnType)) {
+                $returnType = 'int';
             }
             if (\strpos($returnType, 'list<') !== false) {
                 $returnType = \str_replace('list', 'array', $returnType);
             }
             $returnType = Type::toRootNamespace($returnType);
         }
-        $this->types = $returnTypes;
+        $this->types = array_unique($returnTypes);
         $this->nullable = $nullable;
         $this->falsable = $falsable;
     }
diff --git a/generator/tests/PhpStanFunctions/PhpStanTypeTest.php b/generator/tests/PhpStanFunctions/PhpStanTypeTest.php
index bfdf3b8f..fe399866 100644
--- a/generator/tests/PhpStanFunctions/PhpStanTypeTest.php
+++ b/generator/tests/PhpStanFunctions/PhpStanTypeTest.php
@@ -182,4 +182,11 @@ public function testListBecomingArray(): void
         $this->assertEquals('array', $param->getSignatureType(Method::FALSY_TYPE));
     }
 
+    public function testNumbersAreRemoved(): void
+    {
+        $param = new PhpStanType('0|positive-int');
+        $this->assertEquals('int', $param->getDocBlockType());
+        $this->assertEquals('int', $param->getSignatureType());
+    }
+
 }
diff --git a/rector-migrate.php b/rector-migrate.php
index 45af36a9..33d71034 100644
--- a/rector-migrate.php
+++ b/rector-migrate.php
@@ -703,6 +703,7 @@
             'parse_ini_file' => 'Safe\parse_ini_file',
             'parse_ini_string' => 'Safe\parse_ini_string',
             'parse_url' => 'Safe\parse_url',
+            'passthru' => 'Safe\passthru',
             'pcntl_getpriority' => 'Safe\pcntl_getpriority',
             'pcntl_setpriority' => 'Safe\pcntl_setpriority',
             'pcntl_signal' => 'Safe\pcntl_signal',