PHP相当于Javascript substring（）？

Question

Javascript has two handy substring functions: substring(from,to) and substr(start,length).

This means I can decide "when I get my substring starting from position X, do I want to specify what string position to end on or how many characters long the substring is?"

(One nice usage of the from, to version is to use search() to determine both positions.)

PHP's substr() lets you specify the length of the substring. Is there a built-in string function to let you specify the character position to end on?

Answer 1

I think this question is more about logic. You can accomplish both with the substr() function.

For instance. for the First substring(from, to):

$string = 'Foo Bar!';
$from   = 2;
$to     = 5;
$final_string = substr($string, $from, $to - $from);

And the second substr(start,length):

$string = 'Foo Bar!';
$start  = 2;
$length = 5;
$final_string = substr($string, $start, $length);