PHP Exercises: Compute the digit number of sum of two given integers

PHP: Exercise-47 with Solution

Write a PHP program to compute the digit number of sum of two given integers.

Each test case consists of two non-negative integers x and y which are separated by a space in a line.
0 ≤ x, y ≤ 1,000,000

Pictorial Presentation:

PHP: Compute the digit number of sum of two given integers

Sample Solution: -

PHP Code:

 while(true) {
    $inputs = explode(' ', trim(fgets(STDIN))); 
    if (!is_array($inputs) || count($inputs) < 2) {
    $a = $inputs[0];
    $b = $inputs[1]; 
    $d = numDigits($a + $b);
    echo("Digit number of sum of two given integers: ");
    echo $d . "\n";
function numDigits($n) {
    return (int)(log10($n) + 1);

Sample Output:

Digit number of sum of two given integers: 2


Flowchart: Compute the digit number of sum of two given integers

PHP Code Editor:

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Previous: Write a PHP program to find heights of the top three building in descending order from eight given buildings.
Next: Write a PHP program to check whether three given lengths (integers) of three sides form a right triangle. Print "Yes" if the given sides form a right triangle otherwise print "No".

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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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