PHP Exercises : Email validation

Last update on May 30 2022 11:50:33 (UTC/GMT +8 hours)

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:

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.

What is the difficulty level of this exercise?

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC