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<?php $tests = [ ['foo=bar', 'email=foo@'], //invalid email ['foo=bar'], // no email, ['foo=bar', 'email=foo@example.com'], //valid email ]; foreach ($tests as $args) { load_args($args); print_filter(); } function load_args($args) { $str = implode("&", $args); echo "Loading $str into \$_GET\n"; parse_str($str, $_GET); } function print_filter() { $filter = filter_var_array($_GET, [ 'email' => FILTER_VALIDATE_EMAIL, ]); var_dump($filter); }
Output for git.master, git.master_jit, rfc.property-hooks
Loading foo=bar&email=foo@ into $_GET array(1) { ["email"]=> bool(false) } Loading foo=bar into $_GET array(1) { ["email"]=> NULL } Loading foo=bar&email=foo@example.com into $_GET array(1) { ["email"]=> string(15) "foo@example.com" }

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