PHP Unconference Europe 2015

ob_get_contents

(PHP 4, PHP 5)

ob_get_contentsRetourne le contenu du tampon de sortie

Description

string ob_get_contents ( void )

Retourne le contenu du tampon de sortie sans l'effacer.

Valeurs de retour

Retourne le contenu du tampon de sortie sans l'effacer ou FALSE, si la temporisation de sortie n'est pas activée.

Exemples

Exemple #1 Exemple avec ob_get_contents()

<?php

ob_start
();

echo 
"Bonjour ";

$out1 ob_get_contents();

echo 
"le monde !";

$out2 ob_get_contents();

ob_end_clean();

var_dump($out1$out2);
?>

L'exemple ci-dessus va afficher :

string(8) "Bonjour "
string(18) "Bonjour le monde !"

Voir aussi

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User Contributed Notes 6 notes

up
13
mauroasprea+php at gmail dot com
3 years ago
This is an example of how the stack works:

<?php
//Level 0
ob_start();
echo
"Hello ";

//Level 1
ob_start();
echo
"Hello World";
$out2 = ob_get_contents();
ob_end_clean();

//Back to level 0
echo "Galaxy";
$out1 = ob_get_contents();
ob_end_clean();

//Just output
var_dump($out1, $out2);
?>
up
5
DrDreistein at dontknow dot at
3 years ago
i made a simple test which is faster: adding some text in the normal way or by the ob stack:

<?php
$start
= microtime(true);
$var = '';
for(
$i=0 ; $i <= 1000000 ; $i++) {
   
$var .= ' ';
}
$middle = microtime(true);

ob_start();
for(
$i=0 ; $i <= 1000000 ; $i++) {
    echo
' ';
}
$var = ob_get_contents();
ob_end_clean();

$end = microtime(true);

echo
$middle - $start;
echo
'<br />';
echo
$end - $middle;
?>

Outputs something like this:

0.33658003807068
0.30778789520264
up
0
Mark Clements
28 days ago
Note that, unlike PHP variables which make efficient use of memory, getting the contents of the output buffer results in a new copy of the buffer being made.  This can end up massively increasing the memory requirements of your script if your output is large.

Example code:

<?php

print(memory_get_usage() . "<br>");

ob_start();

for (
$i = 0; $i < 5000000; $i++)
    print(
" ");

print(
memory_get_usage() . "<br>");

$foo = ob_get_contents();

print(
memory_get_usage() . "<br>");

ob_end_flush();

?>

Output:

  351664
5359152
10359256
up
0
ipfound at gmail dot com
30 days ago
The ob_get_contents() function has different return behaivor in PHP 5.3.x and PHP 5.5.x. Take a look at very simple example for PHP 5.3

<?php
var_dump
(ob_get_contents());
?>
Output: bool(false)

but in PHP 5.5.x, the same php code will return:
Output: string (0) ""

Actually, we can use type regulation - intval(ob_get_contents()), for cheking On/Off output buffering, but it lays the possible problems in the future.
up
-1
m227 ( at ) poczta dot onet dot pl
9 years ago
if you use ob_start with a callback function as a parameter, and that function changes ob string (as in example in manual) don't expect that ob_get_contents will return changed ob.
it will work as you would use ob_start with no parameter at all. So don't be confused.
up
-1
http://www.francescosaf.altervista.org
9 years ago
transfer image, another method (alternative to fsockopen or function socket) :

server(192.168.0.1)
makeimage.php
       ...........
       ...........
       $nameimage="xxxx.jpg"
       $comand=exec("plotvelocity.sh $nameimage $paramater1 $paramater2");
       ob_start();
        readfile($nameimage);
        $image_data = ob_get_contents();
        ob_end_clean();
        echo $image_data;
        unlink($nameimage);

Client  (192.168.0.2)
  $bild="images/newimage2.gif";
  $host="192.168.0.1";
  $url=file_get_contents("http://$host/makeimage.php?$querystring");
  $fp = fopen("$bild", 'wb');
  fwrite($fp, $url);
  fclose($fp);
  echo '<img src="'.$bild.'">';

naturally you can transfer whichever thing and not only images
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