Substring Compare PHP

Question

Why does this code not echo 0?

$email = "test@example.com";
$ending = "com";

$email = preg_replace('/[^A-Za-z0-9\-]/', '', $email);

echo substr_compare($email, $ending, strlen($ending)-strlen($email), strlen($ending));

I am expecting 0, per documentation.

`strlen($ending)-strlen($email)` Write that down with your example and put in the real numbers and do the math and see what offset you get and where you start the comparison. — Rizier123, Jun 24 '16 at 15:05
@Rizier123 D'oh! `-11`, I guess I need to just do `-strlen($ending)` — Dummy Code, Jun 24 '16 at 15:07
Sometimes when you have a small code example it helps when you write it down and put in the real numbers/values. — Rizier123, Jun 24 '16 at 15:08
@num8er It might be similar, since it shows another way to do it, but I think OP asks here why he got not 0 as output in his specific example. — Rizier123, Jun 24 '16 at 15:15
@Rizier123 author wants to compare that it ends with "com". See title: "Substring Compare PHP". And wants to debug the result by doing echo. I thing var_dump() will return expected result. — num8er, Jun 24 '16 at 15:15
@Rizier123 Does that mean this answer is wrong? http://stackoverflow.com/a/619725/2379592 — Dummy Code, Jun 24 '16 at 16:36

score 0 · Answer 1 · edited May 23 '17 at 11:58

If You want to check if it ends with "com".

Read this: startsWith() and endsWith() functions in PHP

But if You just want to debug the result:

Try to convert integer to string to properly output result.

echo (string)substr_compare($email, $ending, strlen($ending)-strlen($email), strlen($ending));

or do:

$result = substr_compare($email, $ending, strlen($ending)-strlen($email), strlen($ending));
var_dump($result); // or echo (string)$result;

Substring Compare PHP

1 Answers1