Can server be hacked through PHP scripts?

Friend said PHP script was not tight!

[bartainer]

Hello,

Can a server be hacked if a script is not written correctly? PHP being a server side script, how can the script leave a frontdoor unlocked for hackers? The script is not seen in code view, so how can it be penetrated?

Thanks.

[Dijkgraaf]

Do a search for SQL Injection and you fill find various articles on how server side script vunerabilaties can be used. It is not just PHP but any scripting language that can be vunerable to this sort of attack.