php生成一个可选位数的随机码
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php生成一个可选位数的随机码 ?phpecho coding(6);function coding($num){$str_arr = array(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,...