<?php
$fileStr = fopen("tmp/core.php","w");
mkdir("tmp/");
$ob = "<?php\r\n ";
for ($i = 0; $i < 1000; $i++) {
        $file = fopen("tmp/file_".$i.".php","w");
        $buffer = "";
        $class_name = "Class_".sha1(rand());
        $buffer = "class $class_name {\r\n";
        $buffer .= file_get_contents("tmp/default_def.php")."\r\n";
        $buffer .= "}\r\n";
        fwrite($file,"<?php ".$buffer);
        fclose($file);
        $ob .= $buffer."\r\n";
}
fwrite($fileStr,$ob);
fclose($fileStr);