- rand: documentation ( source)
<?php
// Curious about the bytecode difference between comma-separated and period-concatenated echoes
echo 'foo', 'bar', 'baz';
echo 'foo' . 'bar' . 'baz';
$bar = 'bar';
echo 'foo', $bar[rand(0,2)], 'baz';
echo 'foo' . $bar[rand(0,2)] . 'baz';