How do I validate input using php?

From: Date: Wed, 24 Jul 2002 22:38:41 +0000
Subject: How do I validate input using php?
Groups: php.general 
Request: Send a blank email to php-general+get-109377@lists.php.net to get a copy of this message
I've tried a function like this: function validate() { // if ( is_numeric($input1) && is_numeric($input2) && ctype_alpha($input3) && ctype_alpha($input4) ) return true; } And then I call the function: if (validate() == false) { some action; } My problem is I get the action every time, even though the input is of the right type. And, is ctype_alpha() the only way to check for only alphabetic characters? And (this started with one question), anyone got a good solution on validating email-adresses with php?

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