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@ 2014-02-08T07:28:48Z

<?php
$ret_str = "online shell ";
$ret_str = preg_replace("/[^A-Za-z0-9_]/", '', str_replace(' ', '_', $ret_str));
$ret_str = preg_replace("/[_]+/", '_', $ret_str);

echo $ret_str;

Output
Performance
VLD
References
Branches

str_replace: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

40.74 ms | 402 KiB | 5 Q