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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
// pass valid/invalid emails
$email = "[email protected]";
if (filter_var($email, FILTER_VALIDATE_EMAIL)) 
{
     echo '"' . $email . '" = Valid'."\n";
}
else 
{
     echo '"' . $email . '" = Invalid'."\n";
}
?>

Sample 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:

Flowchart: Email validation

PHP Code Editor:

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Previous: Write a PHP script to redirect a user to a different page.
Next: Write a e PHP script to display string, values within a table.

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PHP: Tips of the Day

Mutates the original array to filter out the values specified

Example:

<?php
function tips_pull(&$items, ...$params)
{
  $items = array_values(array_diff($items, $params));
  return $items;
}

$items = ['x', 'y', 'z', 'x', 'y', 'z'];
print_r(tips_pull($items, 'y', 'z'));
?>

Output:

Array
(
    [0] => x
    [1] => x
)