Welcome to the Cookbook

Example of a function definition:

<?php 
function someFunction($arg1, $arg2 = '') {
    if (expr) {
        statement;
    }
    return $var;
}
?>

1. <?php
2. function someFunction($arg1, $arg2 = '') {
3. if (expr) {
4. statement;
5. }
6. return $var;
7. }
8. ?>

Parameters with a default value, should be placed last in function definition. Try to make your functions return something, at least true or false - so it can be determined whether the function call was successful.

<?php 
function connection(&$dns, $persistent = false) {
    if (is_array($dns)) {
        $dnsInfo = &$dns;
    } else {
        $dnsInfo = BD::parseDNS($dns);
    }

    if (!($dnsInfo) || !($dnsInfo['phpType'])) {
        return $this->addError();
    }
    return true;
}
?>

1. <?php
2. function connection(&$dns, $persistent = false) {
3. if (is_array($dns)) {
4. $dnsInfo = &$dns;
5. } else {
6. $dnsInfo = BD::parseDNS($dns);
7. }
8. if (!($dnsInfo) || !($dnsInfo['phpType'])) {
9. return $this->addError();
10. }
11. return true;
12. }
13. ?>

There are spaces on both side of the equals sign.