Split tests/ibase_drop_db_001.phpt into 4 tests

This patch splits `tests/ibase_drop_db_001.phpt` into 4 tests so that we
can check for different error messages depending on which PHP version we
are running.

Author: Jon4t4n

tests/ibase_drop_db_001.phpt

@@ -16,16 +16,8 @@ $db = ibase_query(IBASE_CREATE,
 
 var_dump($db);
 var_dump(ibase_drop_db($db));
-var_dump(ibase_drop_db(1));
-var_dump(ibase_drop_db(NULL));
 
 ?>
 --EXPECTF--
 resource(%d) of type (Firebird/InterBase link)
 bool(true)
-
-Warning: ibase_drop_db() expects parameter 1 to be resource, int given in %s on line %d
-NULL
-
-Warning: ibase_drop_db() expects parameter 1 to be resource, null given in %s on line %d
-NULL

tests/ibase_drop_db_002.phpt

@@ -0,0 +1,33 @@
+--TEST--
+ibase_drop_db(): Make sure passing an integer or null to the function emits a warning
+--SKIPIF--
+<?php
+include("skipif.inc");
+include("skipif-php8-or-newer.inc");
+?>
+--FILE--
+<?php
+
+require("config.inc");
+
+unlink($file = tempnam('/tmp',"php_ibase_test"));
+
+$db = ibase_query(IBASE_CREATE,
+		sprintf("CREATE SCHEMA '%s' USER '%s' PASSWORD '%s' DEFAULT CHARACTER SET %s",$file,
+		$user, $password, ($charset = ini_get('ibase.default_charset')) ? $charset : 'NONE'));
+
+var_dump($db);
+var_dump(ibase_drop_db($db));
+var_dump(ibase_drop_db(1));
+var_dump(ibase_drop_db(NULL));
+
+?>
+--EXPECTF--
+resource(%d) of type (Firebird/InterBase link)
+bool(true)
+
+Warning: ibase_drop_db() expects parameter 1 to be resource, int given in %s on line %d
+NULL
+
+Warning: ibase_drop_db() expects parameter 1 to be resource, null given in %s on line %d
+NULL

tests/ibase_drop_db_003.phpt

@@ -0,0 +1,28 @@
+--TEST--
+ibase_drop_db(): Make sure passing an integer to the function throws an error.
+--SKIPIF--
+<?php
+include("skipif.inc");
+include("skipif-php7-or-older.inc");
+?>
+--FILE--
+<?php
+
+require("config.inc");
+
+unlink($file = tempnam('/tmp',"php_ibase_test"));
+
+$db = ibase_query(IBASE_CREATE,
+		sprintf("CREATE SCHEMA '%s' USER '%s' PASSWORD '%s' DEFAULT CHARACTER SET %s",$file,
+		$user, $password, ($charset = ini_get('ibase.default_charset')) ? $charset : 'NONE'));
+
+var_dump($db);
+var_dump(ibase_drop_db($db));
+var_dump(ibase_drop_db(1));
+
+?>
+--EXPECTF--
+resource(%d) of type (Firebird/InterBase link)
+bool(true)
+
+Fatal error: Uncaught TypeError: ibase_drop_db(): Argument #1 ($link_identifier) must be of type resource, int given in %a

tests/ibase_drop_db_004.phpt

@@ -0,0 +1,28 @@
+--TEST--
+ibase_drop_db(): Make sure passing null to the function throws an error.
+--SKIPIF--
+<?php
+include("skipif.inc");
+include("skipif-php7-or-older.inc");
+?>
+--FILE--
+<?php
+
+require("config.inc");
+
+unlink($file = tempnam('/tmp',"php_ibase_test"));
+
+$db = ibase_query(IBASE_CREATE,
+		sprintf("CREATE SCHEMA '%s' USER '%s' PASSWORD '%s' DEFAULT CHARACTER SET %s",$file,
+		$user, $password, ($charset = ini_get('ibase.default_charset')) ? $charset : 'NONE'));
+
+var_dump($db);
+var_dump(ibase_drop_db($db));
+var_dump(ibase_drop_db(NULL));
+
+?>
+--EXPECTF--
+resource(%d) of type (Firebird/InterBase link)
+bool(true)
+
+Fatal error: Uncaught TypeError: ibase_drop_db(): Argument #1 ($link_identifier) must be of type resource, null given in %a