I have a back door file I install on sites when I take side jobs (i.e. craigslist admin jobs) till the client pays then I remove it. I've only had to use it once. Was setting up a webhosting WHM server for a client and the guy was a total a-hole and kept delaying payment so I went back in and removed everything and crippled his server. needless to say the next day he was willing to pay. i alway remove the extra password or script once paid. i have zero desire to go back into someone's system once my job is complete.
anyway personally i wouldn't name the file self_destruct.php probably something like site_function.inc and the have anything site_proc.php reference that file. But anyway all dev's should have a way back in. its nothing personal, its just that a lot of people are a-holes and look to rip people off.
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