Allow only imgur images in signature

[Fonzzy]

Hey,
I'm trying to make an if else statement in php to allow only imgur images in the signature.

It should look something like:

if (condition) {
    code to be executed if condition is true;
} else {
    code to be executed if condition is false;
}

But I'm clueless on what to do next.

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Bumping thread. Thanks