ldapsearch on dn working, but not with php - php

Question

I'm working with a service provider, who handles the hosting of the virtual server and the configuration of the LDAP server.
My job is to create a PHP application that use the LDAP to create a user at login (to keep things simple).
After many shares with the service provider, I finally achieve to contact the LDAP server with the following:
ldapsearch -x -LLL -h vmdc2.local -D email#local -w myPassword -b"CN=xxx,OU=APPLICATIF,OU=GROUPES,OU=UTILISATEUR,DC=enterprise,DC=local"
It comes from the ldap-utils Linux packet. This query returns good results.
So I created a simple script, trying to use the previous DN to list the users in CLI, for proof of work in PHP.
<?php
// create connection to LDAP server
$ldapconn = ldap_connect("ldap://vmdc2.local")
or die("Impossible to connect to the LDAP server.");
$ldapbind = ldap_bind($ldapconn, 'email#local', 'myPassword');
// check binding
if ($ldapbind) {
echo "Successfully connected to LDAP !" . PHP_EOL;
$dn = 'CN=xxx,OU=APPLICATIF,OU=GROUPES,OU=UTILISATEUR,DC=enterprise,DC=local';
$sr = ldap_list($ldapconn, $dn, 'cn=*');
if (false === $sr) {
die('Impossible to use the dn: ' . $dn . PHP_EOL);
}
$info = ldap_get_entries($ldapconn, $sr);
if ($info['count'] === 0) die('No entries :(');
for ($i=0; $i < $info["count"]; $i++) {
echo $info[$i]["cn"][0] . PHP_EOL;
}
} else {
$var = '';
ldap_get_option($ldapconn, LDAP_OPT_ERROR_STRING, $var);
echo "Connection to LDAP failed..." . PHP_EOL . $var . PHP_EOL;
}
The script output No entries :(
My questions
How can I get a different result from PHP on the same DN?
It is possible to configure how the LDAP server can answer, in the function of who is calling him?
It's my first time against LDAP, so I'm lost :/ Your help is really welcome!