<?php
$soz = 'test';
$d = 0;
while($d <= 50)
{
echo $soz . "<br />";
$d++;
}
?>
// yoki 
 
<?php
$soz = 'test';
for ($d = 1; $d <= 50; $d++)
  {
  echo $soz . "<br />";
  }
?>

<?php
$rand = array(); 
$kod = true; 
$belgilar = array('a','A','b','B','c','C','d','D','e','E','f','F','g','G','h','H','i','I','j',
'J','k','K','l','L','m','M','n','N','o','O','p','P','q','Q','r','R','s','S','t','T','u','U',
'v','V','w','W','z','Z','Y','y','x','X','1','2','3','4','5','6','7','8','9','0');
 
for ($i=0; $i<5;$i++)
{
$ran = $belgilar[mt_rand(0,count($belgilar))]; 
if ($kod == true)
{
$rand[] = $ran;
}
else
{
$rand[] = strtolower($ran); 
}
}
 
echo implode("",$rand);