replacing words ?!?!?

[HaLaBi]

hello,
i want know how to replace a word with another,, or a sentence with another sentence, of cource in Mysql table,, using php..
for example i have "hello people" in all my records in the table, and i want to change it to "hello mates",,, how do i do that using PHP...??
thanx alot

[Admin]

Posting on a different site won't help you, you still need to show you are a licensed user by going to this page and entering your username (HaLaBi).

[HaLaBi]

i quess this is not the only php forun in planet earth....

any way thanx alot...