[PHP-CLI] A few Collatz-related stuff

<?php
$counter = 1;
ini_set("precision",13);
$maxsteps = 0;
$str = file_get_contents(".log");
got_back:
$array = [3,    //a in a/2^k x + b/2^k >= 0
          1,    //k's max value
          1,    //b lol
          1];   //x's min value
print "Randomized test #$counter\n";
$str .= "#$counter : ";
for ($i = 1; $i > 0; $i++) {
    $temp = [3*$array[0]/(2**$array[1]),
             min(rand(1,intval(log(3*$array[0])/log(2))),intval(log(3*$array[0])/log(2))),
             3*$array[2]/(2**$array[1]),
             ceil(max($array[3],(3*$array[2]+1)/(2**(intval(log(3*$array[0])/log(2))+1)-3*$array[0])))];
    $temp[3] = ceil($temp[3]);
    print "Step $i : (".round($temp[0],5)."a_0+".round($temp[2],5).")/2^k>=a_0 iff k<=".round(intval(log(3*$array[0])/log(2)),5)." when a_0>=".round($temp[3],5).". ";
    $fullcounter++;
    print "We'll choose k=".round($temp[1],3);
    $minmax = max($minmax,$temp[3]);
    $avgxmin += $temp[3];
    $maxk = max($maxk,round(intval(log(3*$array[0])/log(2)),5));
    $avgkmax += round(intval(log(3*$array[0])/log(2)),5);
    $array = $temp;
    if ($temp[1] <= 0) {
        print "...\nOh wait, we had k>0. Contradiction !\n\n";
        $maxsteps = max($maxsteps,$i);
        $avgsteps += $i;
        print "(Average n° of steps : ".($avgsteps/$counter).", average minimal value of a_0 required in a step : ".($avgxmin/$counter).", average max k : ".($avgkmax/$counter).")\n\n\n\n";
        $str .= "Average n° of steps : ".($avgsteps/$counter).", average minimal value of a_0 required in a step : ".($avgxmin/$fullcounter).", average max k : ".($avgkmax/$fullcounter)."\n";
        if ($counter % 100 == 0) { file_put_contents(".log",$str); }
        $counter++;
        goto got_back;
    }
    print "\n";
}
goto got_back;
?>