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PHP Exercises: Get the last element for which the given function returns a truth value

PHP: Exercise-81 with Solution

Write a PHP program to get the last element for which the given function returns a truth value.

Sample Solution: -

PHP Code:

<?php
function find_Last($items, $func)
{
    $filteredItems = array_filter($items, $func);

    return array_pop($filteredItems);
}

echo find_Last([1, 2, 3, 4], function ($n) {
    return ($n % 2) === 1;
});
echo "\n";
echo find_Last([1, 2, 3, 4], function ($n) {
    return ($n % 2) === 0;
});

?>

Sample Output: 

3
4

Flowchart:

Flowchart: Get the last element for which the given function returns a truthy value.

PHP Code Editor:

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Previous: Write a PHP program to create a new array with n elements removed from the left.
Next: Write a PHP program to to get the index of the last element for which the given function returns a truth value.

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PHP: Tips of the Day

PHP: Correct file permissions for WordPress

When you setup WP you (the webserver) may need write access to the files. So the access rights may need to be loose.

chown www-data:www-data  -R * # Let Apache be owner
find . -type d -exec chmod 755 {} \;  # Change directory permissions rwxr-xr-x
find . -type f -exec chmod 644 {} \;  # Change file permissions rw-r--r-

After the setup you should tighten the access rights, according to Hardening WordPress all files except for wp-content should be writable by your user account only. wp-content must be writable by www-data too.

chown <username>:<username>  -R * # Let your useraccount be owner
chown www-data:www-data wp-content # Let apache be owner of wp-content

Maybe you want to change the contents in wp-content later on. In this case you could

  • temporarily change to the user to www-data with su,
  • give wp-content group write access 775 and join the group www-data or
  • give your user the access rights to the folder using ACLs.

Whatever you do, make sure the files have rw permissions for www-data.

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

 

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