I got this error message when i run my php CodeIgniter project:
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by
(output started at
C:\AppServ\www\tree\application\models\mtree.php:17)
Filename: core/Common.php
Line Number: 442
line 17:
echo $row->members_id . "";
this is my model function:
function convert_all() {
$this->db->empty_table('table1');
$this->db->empty_table('table2');
$this->db->query("INSERT INTO `table1` (`members_id`, `members_username`);
$query = $this->db->get('table2');
foreach ($query->result() as $row) {
if ($row->members_id > 1) {
echo $row->members_id . "";
}
if ($this->isadvanced($row->members_id, $row->members_direct_id)) {
$this->insert_to_right($row, $row->members_direct_id);
} else {
$this->insert_to_left($row, $row->members_direct_id);
}
}
}
Answer
While using codeigniter, its best recommended that you echo
only in views.
Echoing anywhere randomly sends some data to browser, after which you can't modify headers (this includes attempt to redirect, set content-type, etc)
You should re-organize your code, such that, echo
are done within views only. This will solve your header issues in Codeigniter.
This also includes extra whitespaces at the end after the closing brace "} ?>
" in non-view php files.
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