\ php I was getting the error of " call to undefined function mysql. PHP: Call to undefined function mssql_ connect( ) 0. Resolving a Fatal error: Call to undefined function mysql_ connect( ) in RedHat Symptoms. In RedHat Linux, you have installed the PHP, MySQL, and Apache packages through the package manager. Fatal error: Call to undefined function: ocilogon( ) Submitted:. [ : 57 UTC] net 1) you need php_ oci. dll 2) you need OCI client libraries. The following error code sends me the error Fatal error:. Calling the undefined function mysql_ connect