Why would one omit the close tag?

Question

I keep reading it is poor practice to use the PHP close tag ?> at the end of the file. The header problem seems irrelevant in the following context (and this

Answer 1

It's pretty useful not to let the closing ?> in.

The file stays valid to PHP (not a syntax error) and as @David Dorward said it allows to avoid having white space / break-line (anything that can send a header to the browser) after the ?>.

For example,

[space here]
[break line here]

won't be valid.

But

will.

For once, you must be lazy to be secure.