Add Curl ext PHP stubs

Closes GH-4557.

ext/curl/curl.stub.php

@@ -0,0 +1,147 @@
+<?php
+
+/** @param resource $handle */
+function curl_close($handle): void {}
+
+/**
+ * @param resource $handle
+ *
+ * @return resource|false
+ */
+function curl_copy_handle($handle) {}
+
+/** @param resource $handle */
+function curl_errno($handle): int {}
+
+/** @param resource $handle */
+function curl_error($handle): string {}
+
+/**
+ * @param resource $handle
+ *
+ * @return string|false
+ */
+function curl_escape($handle, string $string) {}
+
+/**
+ * @param resource $handle
+ *
+ * @return string|bool
+ */
+function curl_exec($handle) {}
+
+function curl_file_create(
+    string $filename,
+    string $mimetype = UNKNOWN,
+    string $postname = UNKNOWN
+): CURLFile {}
+
+/**
+ * @param resource $handle
+ *
+ * @return mixed
+ */
+function curl_getinfo($handle, int $option = UNKNOWN) {}
+
+/**
+ * @param resource $handle
+ *
+ * @return resource|false
+ */
+function curl_init(string $url = UNKNOWN) {}
+
+/**
+ * @param resource $multi_handle
+ * @param resource $handle
+ */
+function curl_multi_add_handle($multi_handle, $handle): int {}
+
+/** @param resource $multi_handle */
+function curl_multi_close($multi_handle): void {}
+
+/**
+ * @param resource $multi_handle
+ *
+ * @return int|false
+ */
+function curl_multi_errno($multi_handle): int {}
+
+/** @param resource $multi_handle */
+function curl_multi_exec($multi_handle, &$still_running): int {}
+
+/** @param resource $multi_handle */
+function curl_multi_getcontent($multi_handle): ?string {}
+
+/**
+ * @param resource $multi_handle
+ *
+ * @return array|false
+ */
+function curl_multi_info_read($multi_handle, &$msgs_in_queue = null) {}
+
+/** @return resource */
+function curl_multi_init() {}
+
+/**
+ * @param resource $multi_handle
+ * @param resource $handle
+ */
+function curl_multi_remove_handle($multi_handle, $handle): int {}
+
+/** @param resource $multi_handle */
+function curl_multi_select($multi_handle, float $timeout = 1.0): int {}
+
+/**
+ * @param resource $multi_handle
+ * @param mixed $value
+ */
+function curl_multi_setopt($multi_handle, int $option, $value): bool {}
+
+function curl_multi_strerror(int $error_number): ?string {}
+
+#if LIBCURL_VERSION_NUM >= 0x071200 /* 7.18.0 */
+/** @param resource $handle */
+function curl_pause($handle, int $bitmask): int {}
+#endif
+
+/** @param resource $handle */
+function curl_reset($handle): void {}
+
+/**
+ * @param resource $handle
+ * @param array<int, mixed> $options
+ */
+function curl_setopt_array($handle, array $options): bool {}
+
+
+/**
+ * @param resource $handle
+ * @param mixed $value
+ */
+function curl_setopt($handle, int $option, $value): bool {}
+
+/** @param resource $share_handle */
+function curl_share_close($share_handle): void {}
+
+/** @param resource $share_handle */
+function curl_share_errno($share_handle): int {}
+
+/** @return resource */
+function curl_share_init() {}
+
+/** @param resource $share_handle */
+function curl_share_setopt($share_handle, int $option, $value): bool {}
+
+function curl_share_strerror(int $error_number): ?string {}
+
+function curl_strerror(int $error_number): ?string {}
+
+/**
+ * @param resource $handle
+ *
+ * @return string|false
+ */
+function curl_unescape($handle, string $string) {}
+
+/** @return array|false */
+function curl_version(int $age = UNKNOWN) {}