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奔跑在天山

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[求助] PHP编程

大家好,我这里有一个PHP编程的题,是先将字符串:tomorrow_and_tomorrow_and_tomorrow转换成bwt_t:  wwwdd__nnoooaatttmmmrrrrrrooo__$ooo;再转换成t_back:  $worromot_dna_worromot_dna_worromot。这后一步的程序我不会写(也就是“function reverseBwt($bw){”这一步),求高手指点。谢谢各位了

程序:
// Dr. Han’s implementation of the BWT
// 20140408
$t = "tomorrow_and_tomorrow_and_tomorrow";
$bwt_t = bwt($t);
$tBack = reverseBwt($bwt_t);
print "t: $t\n";
print "bwt_t: $bwt_t\n";
print "t_back: $tBack\n";
print "Job done!\n";
function bwt($t){
……
}
function reverseBwt($bw){
……
}



结果:
‐bash‐3.2$ php bwt.php
t: tomorrow_and_tomorrow_and_tomorrow
bwt_t:
wwwdd__nnoooaatttmmmrrrrrrooo__$ooo
t_back:
$worromot_dna_worromot_dna_worromot
Job done!
‐bash‐3.2$
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