How to generate 34 alphanumerics with a pattern in PHP? [closed]

I want to generate 34 random letters (capitalized and not) and numbers. Before the generated 34 random alphanumerics there is a word pro_sec_ which is there everytime it generate. And the 25th & 26th is 00

So the generated result will be: (just an example)

pro_sec_Vy6Q67sh6HvP90j7gWnq6SxN00p8Gapu66

Another ex. pro_sec_6B57nTshusbnay6esjabxns800nGvaz2Lov

The pro_sec_ and the 00 there in 25th and 26th are always the same and the rest are just generated.