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:

<?php
// 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";
}
else 
{
    // If the email is invalid, print a message indicating it is invalid
    echo '"' . $email . '" = Invalid'."\n";
}
?>

Explanation:

• Specify Email Address:
• The $email variable is set to "[email protected]", which represents the email address to validate.
• Filter Validation:
• The filter_var() function is used with the FILTER_VALIDATE_EMAIL filter to check if the $email variable contains a valid email format.
• Conditional Check:
• An if statement checks the result of filter_var().
• If filter_var() returns true (indicating a valid email), the code inside the if block runs.
• Output for Valid Email:
• If the email is valid, it prints "<email> = Valid" to indicate that the email format is correct.
• Output for Invalid Email:
• If the email is not valid, it goes to the else block, printing "<email> = Invalid" to indicate an incorrect format.
• End of Script:
• The code ends after displaying whether the email is valid or invalid.

Output:

"[email protected]" = Valid

filter_var() function:

Syntax:

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

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

Parameters:

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

Flowchart:

PHP Code Editor:

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