ここにいたら

if [someone] were here

→ 此処
phrase Rare #27,448
if [someone] were here Used to express a hypothetical situation in which someone is present here. It can also appear with な to express a wistful wish, as in ここにいたらな (I wish [someone] were here).
JA: あなたがここにいたら、もっと楽しいのに。
EN: If you were here, it would be more fun.

ここにいたらだめだよシャワーを浴びてきなさい

You can't stay here. Go take a shower!

— ライフ・イズ・ビューティフル (1997)

もし彼女がここにいたら真実を話せるのに

If only she were here now, I could tell her the truth.

ここにいたら殺される

I'll be killed if I stay here.

— グッドフェローズ (1990)

ベスここにいたら

I wish Beth were here right now.

ここにいたら危ない

It’s dangerous to stay here.

— ロシアン・ブラザー (1997)

ここにいたら殺される

If you stay here, you'll be killed.

— ロシアン・ブラザー (1997)