PHP preg replace only allow numbers

php preg-replace

I think you're saying you want to remove all non-numeric characters. If so, \D means "anything that isn't a digit":

preg_replace('/\D/', '', $c)

php preg-replace

Try this:

return preg_replace("/[^0-9]/", "",$c);

php preg-replace

This should do what you want:

preg_replace("/[^0-9]/", "",$c);

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