PHP Validate email if value is not empty [duplicate]

Question

Possible Duplicate:
Validate Email in php

how to validate email IF user did fill up form field ( do not validate if field is not modified ) ?

Example:

if ($formemail ="" ) /* user DIDN'T enter email/not filled up email field */ { /* do not validate and do not =mail($,$,$,$) */ }

but if field is modified THEN validate if its ok then =mail($,$,$,$)

$formemail ="" should be $formemail ==""

Luca Rainone
– Luca Rainone

2012-12-02 16:44:23 +00:00
Commented Dec 2, 2012 at 16:44 — Luca Rainone
– Luca Rainone, Commented Dec 2, 2012 at 16:44
where you assigning the $dormemail ?

Mayank K. Swami
– Mayank K. Swami

2012-12-02 16:52:49 +00:00
Commented Dec 2, 2012 at 16:52 — Mayank K. Swami
– Mayank K. Swami, Commented Dec 2, 2012 at 16:52

wadie · Accepted Answer · 2012-12-02 16:46:06Z

0

You can use HTML5 attributes to get that done.

<input type="text" class="email" email="email" required />

The required attribute makes sure the field has some value,and the email attribute checks if the value is an email. :)

answered Dec 2, 2012 at 16:46

wadie

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3 Comments

Pjottur Over a year ago

Yes, but this html5 input type is not 100% supported across all browsers

Jared Farrish Over a year ago

Server-side validation should always take place. Doing it in the browser should strictly be seen as a UI improvement in response to the user.

wadie Over a year ago

True,server-side validation should always take place. sorry about that! I usually check if the field is empty,however I leave it to HTML5 to check if an email was entered.

Pjottur · Accepted Answer · 2012-12-02 16:48:42Z

Just do this:

if($formemail != ""){ //validate and send }

You don't need an else statement here.

Oliver Spryn · Accepted Answer · 2012-12-02 16:49:41Z

Try this (from http://www.linuxjournal.com/article/9585):

function checkEmail($email) { if(preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/", $email)) { return true; } return false; } if (!empty($formemail) && checkEmail($formemail)) { //Mail it! }

- Don't try this at home kids. Learn about filter_var.

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