JAVA logout mode is converted into PHP code, how to write it?

The JAVA logout mode is converted into PHP code, as shown below:

Sig generation mode:

Keywords: aUdqk-BvLwKl

Time: current time. (dragon)

Num: random number. (dragon)

SHA 1 (key+time+number)

Take java as an example:

Private static string encryption (string key, long time, long number) {

byte[]k = key . getbytes()；

byte[]t = getBytesByLong(times)；

byte[]n = getBytesByLong(num)；

Byte[] np = new byte [k.length+t.length+n.length];

int I = 0；

for(int j = 0； J<k. Length; j++，i++){

NP[I]= k[j]；

}

for(int j = 0； J<t. Length; j++，i++){

NP[I]= t[j]；

}

for(int j = 0； J<n. Length; j++，i++){

NP[I]= n[j]；

}

string sha 1 = sha 1 util . getsha 1(NP)；

Return sha1;

}