Increase psalm strictness (#925)

* Fix PossiblyUndefinedArrayOffset

ERROR: PossiblyUndefinedArrayOffset - ../src/Curl/Curl.php:1890:28 -
Possibly undefined array key (see https://psalm.dev/167)
                list($key, $value) = explode(':', $raw_headers[$i], 2);

* Fix PossiblyUndefinedArrayOffset

ERROR: PossiblyUndefinedArrayOffset - ../src/Curl/Curl.php:1034:28 -
Possibly undefined array key (see https://psalm.dev/167)
                list($key, $value) = explode(':', $header, 2);

* Fix PossiblyUndefinedArrayOffset

ERROR: PossiblyUndefinedArrayOffset - ../src/Curl/MultiCurl.php:465:28 -
Possibly undefined array key (see https://psalm.dev/167)
                list($key, $value) = explode(':', $header, 2);

* Fix PossiblyInvalidOperand

ERROR: PossiblyInvalidOperand - ../src/Curl/Curl.php:1407:69 - Cannot
concatenate with a int<0, max>|string (see https://psalm.dev/163)
                    echo 'Response content length (calculated): ' . $response_calculated_length . "\n";

* Fix PossiblyInvalidArgument

ERROR: PossiblyInvalidArgument - ../src/Curl/BaseCurl.php:408:34 -
Argument 2 of define expects array<array-key, mixed>|null|scalar, but
possibly different type false|resource provided (see
https://psalm.dev/092)
                define('STDERR', fopen('php://stderr', 'wb'));

* Fix ArgumentTypeCoercion

ERROR: ArgumentTypeCoercion - ../src/Curl/MultiCurl.php:956:16 -
Argument 1 of usleep expects int<0, max>, but parent type int provided
(see https://psalm.dev/193)
        usleep((int) $sleep_seconds * 1000000);

* Fix PossiblyFalseArgument

ERROR: PossiblyFalseArgument - ../src/Curl/MultiCurl.php:131:50 -
Argument 2 of file_put_contents cannot be false, possibly
array<array-key, string>|resource|string value expected (see
https://psalm.dev/104)
                    file_put_contents($filename, stream_get_contents($fh));

* Fix PossiblyFalseArgument

ERROR: PossiblyFalseArgument - ../src/Curl/Curl.php:437:49 - Argument 2
of stream_copy_to_stream cannot be false, possibly resource value
expected (see https://psalm.dev/104)
                stream_copy_to_stream($tmpfile, $fh);

ERROR: PossiblyFalseArgument - ../src/Curl/Curl.php:438:24 - Argument 1
of fclose cannot be false, possibly resource value expected (see
https://psalm.dev/104)
                fclose($fh);

* Fix PossiblyFalseArgument

ERROR: PossiblyFalseArgument - ../src/Curl/Curl.php:463:49 - Argument 2
of stream_copy_to_stream cannot be false, possibly resource value
expected (see https://psalm.dev/104)
            stream_copy_to_stream($file_handle, $main_file_handle);

ERROR: PossiblyFalseArgument - ../src/Curl/Curl.php:468:16 - Argument 1
of fclose cannot be false, possibly resource value expected (see
https://psalm.dev/104)
        fclose($main_file_handle);

* Fix PossiblyFalseArgument

ERROR: PossiblyFalseArgument - ../src/Curl/Curl.php:1891:36 - Argument 1
of count cannot be false, possibly Countable|array<array-key, mixed>
value expected (see https://psalm.dev/104)
        $raw_headers_count = count($raw_headers);

ERROR: PossiblyInvalidArrayAccess - ../src/Curl/Curl.php:1893:24 -
Cannot access array value on non-array variable $raw_headers of type
false (see https://psalm.dev/109)
            if (strpos($raw_headers[$i], ':') !== false) {

* Fix PossiblyInvalidArgument

ERROR: PossiblyInvalidArgument - ../src/Curl/Curl.php:1868:30 - Argument
2 of define expects array<array-key, mixed>|null|scalar, but possibly
different type false|resource provided (see https://psalm.dev/092)
            define('STDOUT', fopen('php://stdout', 'w'));

* Update psalm baseline

src/Curl/BaseCurl.php

@@ -404,10 +404,11 @@ abstract class BaseCurl
     public function verbose($on = true, $output = 'STDERR')
     {
         if ($output === 'STDERR') {
-            if (!defined('STDERR')) {
-                define('STDERR', fopen('php://stderr', 'wb'));
+            if (defined('STDERR')) {
+                $output = STDERR;
+            } else {
+                $output = fopen('php://stderr', 'wb');
             }
-            $output = STDERR;
         }
 
         // Turn off CURLINFO_HEADER_OUT for verbose to work. This has the side

src/Curl/Curl.php

@@ -430,8 +430,10 @@ class Curl extends BaseCurl
 
             $curl->downloadCompleteCallback = function ($instance, $tmpfile) use ($part_file_name) {
                 $fh = fopen($part_file_name, 'wb');
-                stream_copy_to_stream($tmpfile, $fh);
-                fclose($fh);
+                if ($fh !== false) {
+                    stream_copy_to_stream($tmpfile, $fh);
+                    fclose($fh);
+                }
             };
 
             $multi_curl->addCurl($curl);
@@ -447,6 +449,9 @@ class Curl extends BaseCurl
 
         // Combine downloaded chunks into a single file.
         $main_file_handle = fopen($filename, 'w');
+        if ($main_file_handle === false) {
+            return false;
+        }
 
         foreach ($part_file_names as $part_file_name) {
             if (!is_file($part_file_name)) {
@@ -1031,7 +1036,7 @@ class Curl extends BaseCurl
             }
         } else {
             foreach ($headers as $header) {
-                list($key, $value) = explode(':', $header, 2);
+                list($key, $value) = array_pad(explode(':', $header, 2), 2, '');
                 $key = trim($key);
                 $value = trim($value);
                 $this->headers[$key] = $value;
@@ -1404,7 +1409,7 @@ class Curl extends BaseCurl
                 if (isset($this->responseHeaders['Content-Length'])) {
                     echo 'Response content length (from content-length header): ' . $response_header_length . "\n";
                 } else {
-                    echo 'Response content length (calculated): ' . $response_calculated_length . "\n";
+                    echo 'Response content length (calculated): ' . (string)$response_calculated_length . "\n";
                 }
 
                 if (
@@ -1859,13 +1864,15 @@ class Curl extends BaseCurl
         // Fix "PHP Notice: Use of undefined constant STDOUT" when reading the
         // PHP script from stdin. Using null causes "Warning: curl_setopt():
         // supplied argument is not a valid File-Handle resource".
-        if (!defined('STDOUT')) {
-            define('STDOUT', fopen('php://stdout', 'w'));
+        if (defined('STDOUT')) {
+            $output = STDOUT;
+        } else {
+            $output = fopen('php://stdout', 'w');
         }
 
         // Reset CURLOPT_FILE with STDOUT to avoid: "curl_exec(): CURLOPT_FILE
         // resource has gone away, resetting to default".
-        $this->setFile(STDOUT);
+        $this->setFile($output);
 
         // Reset CURLOPT_RETURNTRANSFER to tell cURL to return subsequent
         // responses as the return value of curl_exec(). Without this,
@@ -1881,13 +1888,16 @@ class Curl extends BaseCurl
      */
     private function parseHeaders($raw_headers)
     {
-        $raw_headers = preg_split('/\r\n/', (string) $raw_headers, -1, PREG_SPLIT_NO_EMPTY);
         $http_headers = new CaseInsensitiveArray();
+        $raw_headers = preg_split('/\r\n/', (string) $raw_headers, -1, PREG_SPLIT_NO_EMPTY);
+        if ($raw_headers === false) {
+            return ['', $http_headers];
+        }
 
         $raw_headers_count = count($raw_headers);
         for ($i = 1; $i < $raw_headers_count; $i++) {
             if (strpos($raw_headers[$i], ':') !== false) {
-                list($key, $value) = explode(':', $raw_headers[$i], 2);
+                list($key, $value) = array_pad(explode(':', $raw_headers[$i], 2), 2, '');
                 $key = trim($key);
                 $value = trim($value);
                 // Use isset() as array_key_exists() and ArrayAccess are not compatible.

src/Curl/MultiCurl.php

@@ -127,7 +127,10 @@ class MultiCurl extends BaseCurl
             } else {
                 $curl->fileHandle = fopen('php://temp', 'wb');
                 $curl->downloadCompleteCallback = function ($instance, $fh) use ($filename) {
-                    file_put_contents($filename, stream_get_contents($fh));
+                    $contents = stream_get_contents($fh);
+                    if ($contents !== false) {
+                        file_put_contents($filename, $contents);
+                    }
                 };
             }
         }
@@ -462,7 +465,7 @@ class MultiCurl extends BaseCurl
             }
         } else {
             foreach ($headers as $header) {
-                list($key, $value) = explode(':', $header, 2);
+                list($key, $value) = array_pad(explode(':', $header, 2), 2, '');
                 $key = trim($key);
                 $value = trim($value);
                 $this->headers[$key] = $value;
@@ -946,7 +949,13 @@ class MultiCurl extends BaseCurl
         $sleep_seconds = $sleep_until - microtime(true);
 
         // Avoid using time_sleep_until() as it appears to be less precise and not sleep long enough.
-        usleep((int) $sleep_seconds * 1000000);
+        // Avoid using usleep(): "Values larger than 1000000 (i.e. sleeping for
+        //   more than a second) may not be supported by the operating system.
+        //   Use sleep() instead."
+        $sleep_seconds_int = (int)$sleep_seconds;
+        if ($sleep_seconds_int >= 1) {
+            sleep($sleep_seconds_int);
+        }
 
         // Ensure that enough time has passed as usleep() may not have waited long enough.
         $this->currentStartTime = microtime(true);