Solaris 2.7, BerkelyDB 2.7.7, OpenLDAP 1.2.11, Apache 1.3.12.  A test script (below) when run with PHP4 (4.0.2) fails with a "Document contains no data"; it works perfectly fine in PHP3 (3.0.16).  Nothing is changed, simply change the Apache config file to enable 3 or 4 and test:

<?php
  $SERVER = "localhost";
  $ROOTDN = "cn=manager, dc=fluid, dc=com";
  $ROOTPW = "[MY SECRET PASSWORD]";
  $ldap=ldap_connect($SERVER);
  if($ldap) {
    if(ldap_bind($ldap, $ROOTDN, $ROOTPW)) {
      $entry["uid"]="tuser";
      $entry["cn"]="Test User";
      $entry["sn"]="User";
      $entry["objectClass"]="person";
      $dn="uid=tuser, ou=Employees, dc=fluid, dc=com";
      if(ldap_add($ldap, $dn, $entry)) {
        print("<H3>Entry Added!</H3>");
      } else {
        print("<H3>Add Failed!</H3>");
        $error=ldap_error($ldap);
        print("<BR>($error)");
      }
      print("</body></html>");
    }
    @ldap_close($ldap);
  } else {
    print("Connection Failed!");
    $error=ldap_error($ldap);
    print("<BR>($error)");
  }
?>

Configuration params for all tools:

BerkleyDB 2.7.7:
../dist/configure

OpenLDAP 1.2.11:
env \
  ac_cv_func_pthread_create=no ol_cv_kthread_flag=no \
  ol_cv_pthread_flag=no ol_cv_pthreads_flag=no \
  ol_cv_thread_flag=no \
  CPPFLAGS="-I/usr/local/BerkeleyDB/include" \
  LDFLAGS="-L/usr/local/BerkeleyDB/lib" \
  ./configure --with-ldbm-api=db2

Apache 1.3.12:
./configure \
  --with-layout=Apache \
  --prefix=/usr/local/dbdev/apache \
  --enable-module=most \
  --enable-shared=max

PHP 4.0.2
./configure \
  --enable-ftp \
  --disable-short-tags \
  --with-ldap=/usr/local \
  --with-apxs=/usr/local/dbdev/apache/bin/apxs \
  --with-oci8=/u01/app/oracle/product/8.1.6 \
  --with-exec-dir=/usr/local/dbdev/php/bin \
  --with-config-file-path=/usr/local/dbdev/php/lib \
  --with-db2=/usr/local/BerkeleyDB

The php.ini file used is the default php.ini-dist, it's never been touched.

-- 
Troy Engel
tengel@fluid.com