What are the differences between count() and sizeof() functions in PHP?

The main difference between count() and sizeof() functions in PHP is that count() is a language construct while sizeof() is an alias for count(). They both return the number of elements in an array, but count() is more commonly used and recommended for consistency. Using count() is preferred as it is a language construct and is faster in terms of performance.

// Example of using count() function
$array = [1, 2, 3, 4, 5];
$count = count($array);
echo $count;