PHP Coding Challenges for Practice

Use array_merge() to combine two arrays into one, appending the second array to the first.

Sort a 2D array by multiple columns with directions.

Use array_push() to add elements to an array and count() to get the new array length.

Check if a value exists in an array without in_array.

Sort an associative array by its values in ascending order using PHP.

Use number_format() to format numbers with grouped thousands and decimal places.

Use PHP's isset() and empty() to safely check if a variable exists and has a non-empty value.

Extract all regex matches from a string.

Parse a CSV string into an array of rows.