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Substring to take all letters after the 4th character

I only have a basic understanding of substring. I am trying to extract the first 4 characters as a string variable and extract the rest of the characters into another string variable. How can I do this using a substring? With PHP

$rest = substr("jKsuSportTopics", -3, 1);
$rest2 = substr("jKsuSportTopics", 4, 0);
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The second argument is the starting index and the third argument is the length of the string. If the third argument is missing, you get the rest of the string.

$first_part = substr("jKsuSportTopics", 0, 4);
$rest = substr("jKsuSportTopics", 4);


Here's a quote from the docs :

... the returned string will start at start

'th position in string

, counting from zero. For example, in the string "abcdef" the character at position 0 is "a", the character at position 2 is "c", and so on.

[...]

If length

given and positive, the returned string will contain no more than length

characters starting with start

(depending on the length of the string).

[...]

If length

omitted, substring starting with start

, until the end of the string is returned.

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