PHP code to remove everything but numbers

I’m trying to remove everything from a string but just numbers (0-9).

I thought this would work..

echo preg_replace("[^0-9]","",'604-619-5135');

But it echos “604-619-5135”. What am I missing???


Try this:

preg_replace('/[^0-9]/', '', '604-619-5135');

preg_replace uses PCREs which generally start and end with a /.

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