CI架構 Cannot modify header information - headers already sent by

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /var/www/fbz/application/models/Content.php:268)

Filename: helpers/url_helper.php

貌似把前面的

$logsession = $this->session->all_userdata();

這句去了也不會報錯

回複內容：

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /var/www/fbz/application/models/Content.php:268)

Filename: helpers/url_helper.php

貌似把前面的

$logsession = $this->session->all_userdata();

這句去了也不會報錯

因為在使用session前已經有輸出了
一般是因為php檔案?>結尾後有空格斷行符號
或者使用了echo或print

