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PHP - Function Header Sent
Syntax
bool headers_sent ([ string &$file [, int &$line ]] )
Definition and Usage
It will check whether header have been sent or not.
Return Values
If headers have already been sent than it will returns true or else false
Parameters
Sr.No | Parameters & Description |
---|---|
1 |
file It contains the information about file or line parameters |
2 |
Line It contains the line number where output has started. |
Example
Try out following example
<?php if (!headers_sent()) { header('Location: http://www.tutorialspoint.com/'); exit; } if (!headers_sent($filename, $linenum)) { header('Location: http://www.tutorialspoint.com/'); exit; } else { echo "Headers already sent in $filename on line $linenum\n" . "Cannot redirect, for now please click this <a " . "href = \"http://www.tutorialspoint.com\">link</a> instead\n"; exit; } ?>
The above example will check whether headers have been sent or not, If it has sent, it shows a message or else it will send headers
php_function_reference.htm
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