В турнире участвуют 20 комманд

<?php
srand();
 
 
 
function names($tactic) {
$fc[0] = "zenit";
$fc[1] = "barcelona";
$fc[2] = "milan";
$fc[3] = "dortmund";
$fc[4] = "real madrid";
$fc[5] = "Juventus";
$fc[6] = "totenhem";
$fc[7] = "manchester united";
$fc[8] = "manchester citi";
$fc[9] = "lokomotiv";
$fc[10] = "CSKA";
$fc[11] = "Chelsea";
$fc[12] = "Inter";
$fc[13] = "Dinamo";
$fc[14] = "Bauren";
$fc[15] = "Arsenal";
$fc[16] = "Valencia";
$fc[17] = "Monako";
$fc[18] = "Inter milan";
$fc[19] = "New castle";
 
 
 
for($i=0;$i<$tactic[$i]; $i++) {
       $m = rand(0,count($fc));
       $d = rand(0,count($fc));
       $m = rand(0,19);
       $d = rand(0,19);
echo "$m   vs ";
echo "$d ";}
}

<?php
 
$fc[0] = "zenit";
$fc[1] = "barcelona";
$fc[2] = "milan";
$fc[3] = "dortmund";
$fc[4] = "real madrid";
$fc[5] = "Juventus";
$fc[6] = "totenhem";
$fc[7] = "manchester united";
$fc[8] = "manchester citi";
$fc[9] = "lokomotiv";
$fc[10] = "CSKA";
$fc[11] = "Chelsea";
$fc[12] = "Inter";
$fc[13] = "Dinamo";
$fc[14] = "Bauren";
$fc[15] = "Arsenal";
$fc[16] = "Valencia";
$fc[17] = "Monako";
$fc[18] = "Inter milan";
$fc[19] = "New castle";
 
function names($commands) {
    shuffle($commands);
    while (($a = array_shift($commands)) && ($b = array_shift($commands))) {
        echo "<p>{$a} VS {$b}</p>";
    }
}
 
names($fc);