ob_get_contents

(PHP 4, PHP 5, PHP 7, PHP 8)

ob_get_contents — Retourne le contenu du tampon de sortie

Description

ob_get_contents(): string|false

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

Liste de paramètres

Cette fonction ne contient aucun paramètre.

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

ob_start() - Enclenche la temporisation de sortie
ob_get_length() - Retourne la longueur du contenu du tampon de sortie

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User Contributed Notes 4 notes

down

Mark Clements ¶

10 years 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

down

mauroasprea+php at gmail dot com ¶

13 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);
?>

down

-1

m227 ( at ) poczta dot onet dot pl ¶

19 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.

down

-4

DrDreistein at dontknow dot at ¶

13 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

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