PHP Coding Challenges for Practice

Sort a 2D array by multiple columns with directions.

Find the maximum value in an array using PHP.

Check if a value exists in an array without in_array.

Find common elements between two arrays.

Sum all even numbers in an array.

Count the number of words in a string using PHP.

Extract all regex matches from a string.

Reverse a string without strrev.

Check if a string is a palindrome ignoring case and non-alphanumeric chars.

Capitalize the first letter of each word in a name using PHP.

Remove all whitespace from a string using PHP string functions.

Count the number of vowels in a given string using PHP.

Count word frequencies in a string using PHP associative arrays.

Extract initials from a full name using PHP string functions.