il y a bien une série de problèmes potentiels avec la librairie php_mysqli.dll de Wamp1.6.4a, comme expliqué tres justement dans ce post par jphi (jean-philippe) que je remercie,
Il faudra penser à vérifier pour la prochaine version et tout de suite si vous avez des soucis...
Bien à tous et encore merci à jphi. :-) ------------------------------------------------------------------------------- C'est documenté ici : [dev.mysql.com]
PHP -- Windows downloads for connecting to MYSQL from PHP mysqli extension (PHP 5.1.4) mysql extension (PHP 5.1.4)
Why should I download the PHP mysql/mysqli extensions from mysql.com and not from php.net? The binary distribution of mysql.com is based on the latest MySQL Client libraries. Only the libraries used for the mysql.com distributions contain the latest bug fixes and can use all the features of the MySQL Server versions 4.1.20 and 5.0.22.
The PHP 5.1 distribution that is available on php.net is linked against an old version of the MySQL Client API library. The mysql and mysql extensions from php.net are based on the MySQL Client API version 4.1.7. The MySQL Client API versions used for the mysql.com downloads are 4.1.20 and 5.0.22.
We recommend to use the MySQL Client API version that matches the MySQL Server version. For the MySQL Server 5.0.22 you should use the MySQL Client API 5.0.22 (mysql.com download) but not 4.1.7 (php.net download). For example, mysqli_stmt_bind_param() will fail when you try to access a DECIMAL column on a MySQL 5.0.22 server if you use old versions of the MySQL Client API, like the php.net downloads do. ....