How can PHP developers encourage users to input valid email addresses without checking for existence?

To encourage users to input valid email addresses without checking for existence, PHP developers can utilize HTML5 input types like "email" which provide built-in validation for email addresses. This will prompt users to enter a correctly formatted email address before submitting the form. Additionally, developers can provide clear instructions or error messages to guide users in entering valid email addresses. 

<form>
  <label for="email">Email:</label>
  <input type="email" id="email" name="email" required>
  <input type="submit" value="Submit">
</form>

Keywords

PHP form validation regular expressions filter_var email validation

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