PHP Exercises : Email validation

PHP : Exercise-12 with Solution

Write a simple PHP program to check that emails are valid.

Hints : Use FILTER_VALIDATE_EMAIL filter that validates value as an e-mail address.
Note : The PHP documentation does not say that FILTER_VALIDATE_EMAIL should pass the RFC5321.

Sample Solution:

PHP Code:

// Specify an email address (valid or invalid)
$email = "[email protected]";

// Use the filter_var function with FILTER_VALIDATE_EMAIL to check if the email is valid
if (filter_var($email, FILTER_VALIDATE_EMAIL)) 
    // If the email is valid, print a message indicating it is valid
    echo '"' . $email . '" = Valid'."\n";
    // If the email is invalid, print a message indicating it is invalid
    echo '"' . $email . '" = Invalid'."\n";

Sample Output:

"[email protected]" = Valid

filter_var() function:


mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )

filter_var() function filters a variable with a specified filter.


  • variable: Value to filter.
  • filter: The ID of the filter to apply.
  • options: Associative array of options or bitwise disjunction of flags.


Flowchart: Email validation

PHP Code Editor:

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