headers_sent

(PHP 4, PHP 5, PHP 7)

headers_sentChecks if or where headers have been sent

Descrierea

headers_sent ([ string &$file [, int &$line ]] ) : bool

Checks if or where headers have been sent.

You can't add any more header lines using the header() function once the header block has already been sent. Using this function you can at least prevent getting HTTP header related error messages. Another option is to use Output Buffering.

Parametri

file

If the optional file and line parameters are set, headers_sent() will put the PHP source file name and line number where output started in the file and line variables.

line

The line number where the output started.

Valorile întoarse

headers_sent() will return FALSE if no HTTP headers have already been sent or TRUE otherwise.

Exemple

Example #1 Examples using headers_sent()

<?php

// If no headers are sent, send one
if (!headers_sent()) {
    
header('Location: http://www.example.com/');
    exit;
}

// An example using the optional file and line parameters
// Note that $filename and $linenum are passed in for later use.
// Do not assign them values beforehand.
if (!headers_sent($filename$linenum)) {
    
header('Location: http://www.example.com/');
    exit;

// You would most likely trigger an error here.
} else {

    echo 
"Headers already sent in $filename on line $linenum\n" .
          
"Cannot redirect, for now please click this <a " .
          
"href=\"http://www.example.com\">link</a> instead\n";
    exit;
}

?>

Note

Notă:

Antetele vor fi accesibile și afișate doar atunci când este utilizat un SAPI care le susține.

A se vedea și

  • ob_start() - Turn on output buffering
  • trigger_error() - Generează un mesaj de eroare/avertizare/notificare la nivelul utilizatorului
  • headers_list() - Returns a list of response headers sent (or ready to send)
  • header() - Send a raw HTTP header for a more detailed discussion of the matters involved.