PHP set the session storage path to Redis, PHP's fpm crashes

  Redis) {$cfg = [' scheme ' = + env (' Redis_scheme ', ' TCP '), ' host ' = env (' RE            Dis_host ', ' 127.0.0.1 '), ' port ' = env (' Redis_port ', 6379)];        $this->redis = new \predis\client ($CFG); }}/** * Close the session * @since 5.4.0 */Public Function Close () {$this->redis-&gt        ; Quit ();    return true; }/** * Destroy a session * @since 5.4.0 */Public Function Destroy ($session _id) {$this->c        Onnect ();    return $this->redis->del ($session _id);     }/** * Cleanup old sessions * @since 5.4.0 */Public Function GC ($MAXLIFETIME) {return true;        }/** * Initialize session * @since 5.4.0 */Public Function open ($save _path, $session _id) {    return true; }/** * Read session data * @since 5.4.0 */Public Function Read ($session _id) {$this->conNect ();    return $this->redis->get ($session _id);        }/** * Write session data * @since 5.4.0 */Public Function Write ($session _id, $session _data) {        $this->connect ();        $expire = Configure (' Ymf.Account.expire '); if (Is_int ($expire) && $expire > 0) {$result = $this->redis->setex ($session _id, $expire, $sess            Ion_data); $re = $result?        ' True ': ' false ';            }else{$result = $this->redis->set ($session _id, $session _data); $re = $result?        ' True ': ' false ';    } return $re; }}

This is my code, how to debug what went wrong

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  Redis) {$cfg = [' scheme ' = + env (' Redis_scheme ', ' TCP '), ' host ' = env (' RE            Dis_host ', ' 127.0.0.1 '), ' port ' = env (' Redis_port ', 6379)];        $this->redis = new \predis\client ($CFG); }}/** * Close the session * @since 5.4.0 */Public Function Close () {$this->redis-&gt        ; Quit ();    return true; }/** * Destroy a session * @since 5.4.0 */Public Function Destroy ($session _id) {$this->c        Onnect ();    return $this->redis->del ($session _id);     }/** * Cleanup old sessions * @since 5.4.0 */Public Function GC ($MAXLIFETIME) {return true;        }/** * Initialize session * @since 5.4.0 */Public Function open ($save _path, $session _id) {    return true; }/** * Read session data * @since 5.4.0 */Public Function Read ($session _id) {$this->conNect ();    return $this->redis->get ($session _id);        }/** * Write session data * @since 5.4.0 */Public Function Write ($session _id, $session _data) {        $this->connect ();        $expire = Configure (' Ymf.Account.expire '); if (Is_int ($expire) && $expire > 0) {$result = $this->redis->setex ($session _id, $expire, $sess            Ion_data); $re = $result?        ' True ': ' false ';            }else{$result = $this->redis->set ($session _id, $session _data); $re = $result?        ' True ': ' false ';    } return $re; }}

This is my code, how to debug what went wrong

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