rand.php

<?php
// testing how often a number in a given range will appear over many iterations

$max = 10; // how big of a range? ( 1 thru $max )
$iterations = 100000; // how many iterations

// set up an array for keeping tally
$totals = array_fill( 1, $max, 0 );
for ( $i = 1; $i <= $iterations; $i++ ) {
    $totals[ rand( 1, $max ) ]++;
}
echo '<pre>';
foreach ( $totals as $num => $count ) {
    $percent = $count/$iterations*100;
    echo "$num: $percent%\n";
}

echo '</pre>';