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<?php
function convertClientName($name){
/**
* only allow 'a'..'z', '_', '0'..'9'
*/
$allowed = 'abcdefghijklmnopqrstuvwxyz0123456789_';
$res = '';
$name = strtolower(trim($name));
for ($i=0; $i < strlen($name); $i++){
if ($name[$i] == ' ') continue;
if (strpos($allowed, $name[$i]) !== false){
$res .= $name[$i];
}
else {
$res .= '_';
}
}
return $res;
}
?>