- rand: documentation ( source)
<?php
$x = 0;
while($x < 20)
{
$red = rand(0,61);
$a_z_10 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
$r_char = $a_z_10[$red];
$red = rand(0,61);
$g1_char = $a_z_10[$red];
$red = rand(0,61);
$g2_char = $a_z_10[$red];
$red = rand(0,61);
$g3_char = $a_z_10[$red];
$string = $r_char . $g1_char . $g2_char . $g3_char;
echo '<a href="http://puu.sh/' . $string . '">http://puu.sh/' . $string . '</a><br />';
$x++;
}
?>