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php question for the geniuses of the net

Name: Anonymous 2007-09-01 16:14 ID:bekbATGd

how can i validate an input box so that it displays an error if any non-numeric charecters are input using php

Name: Anonymous 2007-09-01 19:59 ID:pA8BUY+r

>>1
is_numeric($x), or preg_match('/^\d*$/', $x).

>>7
Can't be trusted. You can use Javascript beside server validation.

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