php - Place a default email address in when a custom form field is left blank -

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i want place default email address in when custom form field left blank. can't code right. use email address in place of real email address.

<?php if(get_field('cemail')) { ?>  <?php $email =  (get_field('cemail')); if($email!=""){ echo 'email address' ; } ?>

you can like;

<?php  $email = $_get["email"]; if($email=="" || !filter_var($email, filter_validate_email) === false)   $email = "default_email@email.com";  echo $email; ?>

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