The input string contains arbiitrary bytes (say, read from a file). $buf = chr(1) x 1e6 is simply a placeholder.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"I'd rather go naked than blow up my ass"

In reply to Re^2: Interleaving bytes in a string quickly by BrowserUk
in thread Interleaving bytes in a string quickly by BrowserUk

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