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htmlpurifier/maintenance/common.php

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<?php
function assertCli() {
if (php_sapi_name() != 'cli' && !getenv('PHP_IS_CLI')) {
echo 'Script cannot be called from web-browser (if you are indeed calling via cli,
set environment variable PHP_IS_CLI to work around this).';
exit(1);
}
}
// Load useful stuff like FSTools
require_once '../extras/HTMLPurifierExtras.auto.php';