In what scenarios would it be more efficient to use substr() over str_split() in PHP?

If you need to extract a specific portion of a string based on character position or length, it would be more efficient to use substr() over str_split() in PHP. substr() allows you to easily extract a substring from a string using start position and length parameters, while str_split() splits a string into an array of characters, which may not be necessary if you only need a substring.

// Using substr() to extract a specific portion of a string
$string = "Hello, World!";
$substring = substr($string, 7, 5); // Extracts "World"

echo $substring;