请教生成字母加数字

有26个字母{a-Z}和10个数字{0-9}

如果要生成8位字符的，区分大小写，

这样的排列是(26+26+10)8次方＝218340105584896个，这218万亿

但相邻不能有两个或以上相同的如{a1b2cc90，这个字符出现了两次cc}

这样的数据可以用PHP来产生吗？

如果生成单个文本数据应该不太可能，得切割成好多份……

------解决思路----------------------

这个意思？$d = str_split('abcd');

print_r(array_map('join', f(4, $d)));

function f($n, $d) {

$t = array_chunk($d, 1);

if($n > 2) $t = f($n-1, $d);

foreach($t as $x)

foreach(array_chunk($d, 1) as $y) {

if(end($x) != end($y)) $r[] = array_merge($x, $y);

}

return $r;

}Array

(

[0] => abab

[1] => abac

[2] => abad

[3] => abca

[4] => abcb

[5] => abcd

[6] => abda

[7] => abdb

[8] => abdc

[9] => acab

[10] => acac

[11] => acad

[12] => acba

[13] => acbc

[14] => acbd

[15] => acda

[16] => acdb

[17] => acdc

[18] => adab

[19] => adac

[20] => adad

[21] => adba

[22] => adbc

[23] => adbd

[24] => adca

[25] => adcb

[26] => adcd

[27] => baba

[28] => babc

[29] => babd

[30] => baca

[31] => bacb

[32] => bacd

[33] => bada

[34] => badb

[35] => badc

[36] => bcab

[37] => bcac

[38] => bcad

[39] => bcba

[40] => bcbc

[41] => bcbd

[42] => bcda

[43] => bcdb

[44] => bcdc

[45] => bdab

[46] => bdac

[47] => bdad

[48] => bdba

[49] => bdbc

[50] => bdbd

[51] => bdca

[52] => bdcb

[53] => bdcd

[54] => caba

[55] => cabc

[56] => cabd

[57] => caca

[58] => cacb

[59] => cacd

[60] => cada

[61] => cadb

[62] => cadc

[63] => cbab

[64] => cbac

[65] => cbad

[66] => cbca

[67] => cbcb

[68] => cbcd

[69] => cbda

[70] => cbdb

[71] => cbdc

[72] => cdab

[73] => cdac

[74] => cdad

[75] => cdba

[76] => cdbc

[77] => cdbd

[78] => cdca

[79] => cdcb

[80] => cdcd

[81] => daba

[82] => dabc

[83] => dabd

[84] => daca

[85] => dacb

[86] => dacd

[87] => dada

[88] => dadb

[89] => dadc

[90] => dbab

[91] => dbac

[92] => dbad

[93] => dbca

[94] => dbcb

[95] => dbcd

[96] => dbda

[97] => dbdb

[98] => dbdc

[99] => dcab

[100] => dcac

[101] => dcad

[102] => dcba

[103] => dcbc

[104] => dcbd

[105] => dcda

[106] => dcdb

[107] => dcdc

)

------解决思路----------------------

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