Shortened comments. I also think they were too long.

ext/mbstring/tests/mb_ereg-compat-01.phpt

@@ -1,9 +1,11 @@
 --TEST--
-mb_ereg() compatibility test 1 (counterpart: ext/standard/tests/reg/004.phpt)
---POST--
---GET--
+mb_ereg() compat test 1
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="This is a nice and simple string";
+<?php
+/* (counterpart: ext/standard/tests/reg/004.phpt) */
+  $a="This is a nice and simple string";
   if (mb_ereg(".*nice and simple.*",$a)) {
     echo "ok\n";
   }

ext/mbstring/tests/mb_ereg-compat-02.phpt

@@ -1,9 +1,11 @@
 --TEST--
-mb_ereg() compatibility test 2 (counterpart: ext/standard/tests/reg/005.phpt)
---POST--
---GET--
+mb_ereg() compat test 2
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="This is a nice and simple string";
+<?php
+/* (counterpart: ext/standard/tests/reg/005.phpt) */
+  $a="This is a nice and simple string";
   echo mb_ereg(".*(is).*(is).*",$a,$registers);
   echo "\n";
   echo $registers[0];

ext/mbstring/tests/mb_ereg_replace-compat-01.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 1 (counterpart: ext/standard/tests/reg/001.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 1
+--SKIPIF--
+extension_loaded('mbstring') or die('skip'); 
 --FILE--
-<?php $a="abc123";
-  echo mb_ereg_replace("123","def",$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/001.phpt) */
+  $a="abc123";
+  echo mb_ereg_replace("123","def",$a);
+?>
 --EXPECT--
 abcdef

ext/mbstring/tests/mb_ereg_replace-compat-02.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 2 (counterpart: ext/standard/tests/reg/002.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 2
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="abc123";
-  echo mb_ereg_replace("123","",$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/002.phpt) */
+  $a="abc123";
+  echo mb_ereg_replace("123","",$a);
+?>
 --EXPECT--
 abc

ext/mbstring/tests/mb_ereg_replace-compat-03.phpt

@@ -1,10 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 3 (counterpart: ext/standard/tests/reg/003.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 3
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="\\'test";
-  echo mb_ereg_replace("\\\\'","'",$a)
+<?php
+/* (counterpart: ext/standard/tests/reg/003.phpt) */
+  $a="\\'test";
+  echo mb_ereg_replace("\\\\'","'",$a);
 ?>
 --EXPECT--
 'test

ext/mbstring/tests/mb_ereg_replace-compat-04.phpt

@@ -1,9 +1,11 @@
 --TEST--
-mb_ereg_replace() compatibility test 4 (counterpart: ext/standard/tests/reg/006.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 4
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="This is a nice and simple string";
+<?php
+/* (counterpart: ext/standard/tests/reg/006.phpt) */
+  $a="This is a nice and simple string";
   echo mb_ereg_replace("^This","That",$a);
 ?>
 --EXPECT--

ext/mbstring/tests/mb_ereg_replace-compat-05.phpt

@@ -1,12 +1,13 @@
 --TEST--
-mb_ereg_replace() compatibility test 5 (counterpart: ext/standard/tests/reg/007.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 5
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
 <?php 
-	$a="abcd";
-	$b=mb_ereg_replace("abcd","",$a);
-	echo "strlen(\$b)=".strlen($b);
+/* (counterpart: ext/standard/tests/reg/007.phpt) */
+  $a="abcd";
+  $b=mb_ereg_replace("abcd","",$a);
+  echo "strlen(\$b)=".strlen($b);
 ?>
 --EXPECT--
 strlen($b)=0

ext/mbstring/tests/mb_ereg_replace-compat-06.phpt

@@ -1,10 +1,11 @@
 --TEST--
-mb_ereg_replace() compatibility test 6 (counterpart: ext/standard/tests/reg/008.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 6
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
 <?php
-	echo mb_ereg_replace("([a-z]*)([-=+|]*)([0-9]+)","\\3 \\1 \\2\n","abc+-|=123");
+/* (counterpart: ext/standard/tests/reg/008.phpt) */
+  echo mb_ereg_replace("([a-z]*)([-=+|]*)([0-9]+)","\\3 \\1 \\2\n","abc+-|=123");
 ?>
 --EXPECT--
 123 abc +-|=

ext/mbstring/tests/mb_ereg_replace-compat-07.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 7 (counterpart: ext/standard/tests/reg/010.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 7
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="abc122222222223";
-  echo mb_ereg_replace("1(2*)3","\\1def\\1",$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/010.phpt) */
+  $a="abc122222222223";
+  echo mb_ereg_replace("1(2*)3","\\1def\\1",$a);
+?>
 --EXPECT--
 abc2222222222def2222222222

ext/mbstring/tests/mb_ereg_replace-compat-08.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 8 (counterpart: ext/standard/tests/reg/011.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 8
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="abc123";
-  echo mb_ereg_replace("123","def\\0ghi",$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/011.phpt) */
+  $a="abc123";
+  echo mb_ereg_replace("123","def\\0ghi",$a);
+?>
 --EXPECT--
 abcdef123ghi

ext/mbstring/tests/mb_ereg_replace-compat-09.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 9 (counterpart: ext/standard/tests/reg/012.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 9
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="abc123";
-  echo mb_ereg_replace("123",'def\1ghi',$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/012.phpt) */
+  $a="abc123";
+  echo mb_ereg_replace("123",'def\1ghi',$a);
+?>
 --EXPECT--
 abcdef\1ghi

ext/mbstring/tests/mb_ereg_replace-compat-10.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 10 (counterpart: ext/standard/tests/reg/013.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 10
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="abc123";
-  echo mb_ereg_replace("123","def\\g\\\\hi\\",$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/013.phpt) */
+  $a="abc123";
+  echo mb_ereg_replace("123","def\\g\\\\hi\\",$a);
+?>
 --EXPECT--
 abcdef\g\\hi\

ext/mbstring/tests/mb_ereg_replace-compat-11.phpt

@@ -1,9 +1,12 @@
 --TEST--
-mb_ereg_replace() compatibility test 11 (counterpart: ext/standard/tests/reg/014.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 11
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php $a="a\\2bxc";
-  echo mb_ereg_replace("a(.*)b(.*)c","\\1",$a)?>
+<?php
+/* (counterpart: ext/standard/tests/reg/014.phpt) */
+  $a="a\\2bxc";
+  echo mb_ereg_replace("a(.*)b(.*)c","\\1",$a);
+?>
 --EXPECT--
 \2

ext/mbstring/tests/mb_ereg_replace-compat-12.phpt

@@ -1,8 +1,11 @@
 --TEST--
-mb_ereg_replace() compatibility test 12 (counterpart: ext/standard/tests/reg/015.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 12
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php echo mb_ereg_replace("^","z","abc123")?>
+<?php
+/* (counterpart: ext/standard/tests/reg/015.phpt) */
+  echo mb_ereg_replace("^","z","abc123");
+?>
 --EXPECT--
 zabc123

ext/mbstring/tests/mb_ereg_replace-compat-13.phpt

@@ -1,8 +1,11 @@
 --TEST--
-mb_ereg_replace() compatibility test 13 (counterpart: ext/standard/tests/reg/016.phpt)
---POST--
---GET--
+mb_ereg_replace() compat test 13
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
-<?php echo mb_ereg_replace('\?',"abc","?123?")?>
+<?php
+/* (counterpart: ext/standard/tests/reg/016.phpt) */
+  echo mb_ereg_replace('\?',"abc","?123?");
+?>
 --EXPECT--
 abc123abc

ext/mbstring/tests/mb_split-compat-01.phpt

@@ -1,9 +1,10 @@
 --TEST--
-mb_split() compatibility test 1 (counterpart: ext/standard/tests/reg/009.phpt)
---POST--
---GET--
+mb_split() compat test 1
+--SKIPIF--
+extension_loaded('mbstring') or die('skip');
 --FILE--
 <?php
+/* (counterpart: ext/standard/tests/reg/009.phpt) */
 	$a=mb_split("[[:space:]]","this is	a
 test");
 	echo count($a) . "\n";