chunk_split? or posix?

[bookbuyer2000]

What is the most efficient (fastest php parsing) way to change a column of 46 character string into a column of comma-and-quotation mark delimited string of 10 characters, 10 characters, and discard the remaining 26 characters?

Example:

aaaaaaaaaabbbbbbbbbbcccccccccccccddddddddddddd
eeeeeeeeeeffffffffffggggggggggggghhhhhhhhhhhhh

...into this:

"aaaaaaaaaa","bbbbbbbbbb" //notice there's no comma at the end
"eeeeeeeeee","ffffffffff"

[NogDog]

I suspect this would be about as fast as anything:

$new = '"' . substr($string, 0, 10) . '","' . substr($string, 10, 10) . '"';