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ob_get_contents

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

ob_get_contentsRetorna o conteúdo do buffer de saída

Descrição

ob_get_contents(): string|false

Obtém o conteúdo do buffer de saída sem limpá-lo.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Retorna o conteúdo do buffer de saída ou false, se o buffer de saída não estiver ativo.

Exemplos

Exemplo #1 Um simples exemplo de ob_get_contents()

<?php

ob_start
();

echo
"Olá, ";

$out1 = ob_get_contents();

echo
"Mundo";

$out2 = ob_get_contents();

ob_end_clean();

var_dump($out1, $out2);
?>

O exemplo acima produzirá:

string(5) "Olá, "
string(10) "Olá, Mundo"

Veja Também

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User Contributed Notes 4 notes

up
9
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
up
10
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);
?>
up
-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.
up
-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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