Question

I have a array with much different combinations, now, i want to get the number/code that starts with _ at the begin of the array. I tried much things with usort, but not found the best fix.

Example array:

jhdjfhasjdfh234324
6524kl6j245-68tgh345345
ji43h593408ug8gfsspdkf
_23i490u2458djiofjgoskdgk
4534326jk36hj4j526hkj45t
43u25h6jih245ji3

And output:

_23i490u2458djiofjgoskdgk
jhdjfhasjdfh234324
6524kl6j245-68tgh345345
ji43h593408ug8gfsspdkf
4534326jk36hj4j526hkj45t
43u25h6jih245ji3

And, there can’t be more codes that starts with _.

Thanks.

Answer 1

function aux($a, $b) {
    if($a[0] == "_") return -1;
    else if($b[0] == "_") return 1;
    return ($a < $b) ? -1 : 1;
}

usort($data, "aux");