<?php
//эмулируем fetch
function gen_rand_array() {
    $ret=[];
    $l=rand(5,6);
    for ($i=0;$i<$l;$i++) {
        $ret[]=rand(5,100);
    }
    return $ret;
}
 
function array_push_array(&$arr1,&$arr2) {
        array_unshift($arr2,"");
        $arr2[0]=&$arr1;
        call_user_func_array("array_push",$arr2);
        array_shift($arr1);
}
 
$out=[];
for ($n=0;$n<2;$n++) {
        $data=gen_rand_array();
        array_push_array($out,$data);
}
print_r($out);

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