Split tests/bug46247.phpt into 4 tests

This patch splits `tests/bug46247.phpt` into 4 tests so that we can
check for different error messages depending on which PHP version we are
running.

Author: Jon4t4n

tests/bug46247.phpt renamed to tests/bug46247_001.phpt

@@ -1,7 +1,10 @@
 --TEST--
 Bug #46247 (ibase_set_event_handler() is allowing to pass callback without event)
 --SKIPIF--
-<?php include("skipif.inc"); ?>
+<?php
+include("skipif.inc");
+include("skipif-php8-or-newer.inc");
+?>
 --FILE--
 <?php
 

tests/bug46247_002.phpt

@@ -0,0 +1,19 @@
+--TEST--
+Bug #46247 (ibase_set_event_handler() is allowing to pass callback without event)
+--SKIPIF--
+<?php include("skipif.inc"); ?>
+--FILE--
+<?php
+
+require("interbase.inc");
+
+$db = ibase_connect($test_base);
+
+ibase_set_event_handler('foo', 1);
+ibase_set_event_handler($db, 'foo', 1);
+
+?>
+--EXPECTF--
+Warning: ibase_set_event_handler(): Callback argument foo is not a callable function in %s on line %d
+
+Warning: ibase_set_event_handler(): Callback argument foo is not a callable function in %s on line %d

tests/bug46247_003.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Bug #46247 (ibase_set_event_handler() is allowing to pass callback without event)
+--SKIPIF--
+<?php
+include("skipif.inc");
+include("skipif-php7-or-older.inc");
+?>
+--FILE--
+<?php
+
+require("interbase.inc");
+
+$db = ibase_connect($test_base);
+
+function test() { }
+
+ibase_set_event_handler();
+
+?>
+--EXPECTF--
+Fatal error: Uncaught ArgumentCountError: Wrong parameter count for ibase_set_event_handler() in %a

tests/bug46247_004.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Bug #46247 (ibase_set_event_handler() is allowing to pass callback without event)
+--SKIPIF--
+<?php
+include("skipif.inc");
+include("skipif-php7-or-older.inc");
+?>
+--FILE--
+<?php
+
+require("interbase.inc");
+
+$db = ibase_connect($test_base);
+
+function test() { }
+
+ibase_set_event_handler(NULL, 'test', 1);
+
+?>
+--EXPECTF--
+Fatal error: Uncaught TypeError: ibase_set_event_handler(): supplied argument is not a valid InterBase link resource in %a