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@ 2014-03-05T01:20:13Z

<?php
$vowels = array('a','e','i','o','u');
$other = array();

$prev = null;
for ($x=0,$s=null,$s=null;$x<4;$x++) {

    if (in_array($prev, $other)) {
		$s .= $vowels[array_rand($vowels)];
    } else {
		$s .= $other[array_rand($other)];
    }
    $prev = $s;

}

echo $s;

Output
Performance
VLD
References
Branches

array_rand: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive preview

26.48 ms | 402 KiB | 5 Q