ob_get_contents

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

ob_get_contents — Devolver el contenido del búfer de salida

Descripción

ob_get_contents(): string

Obtiene el contenido del búfer de salida, sin borrarlo.

Valores devueltos

Devolverá el contenido del búfer de salida, o false si el almacenameinto en el búfer de salida no está activo.

Ejemplos

Ejemplo #1 Un ejemplo sencillo de ob_get_contents()

<?php

ob_start();

echo "Hola ";

$salida1 = ob_get_contents();

echo "Mundo";

$salida2 = ob_get_contents();

ob_end_clean();

var_dump($salida1, $salida2);
?>

El resultado del ejemplo sería:

string(5) "Hola "
string(10) "Hola Mundo"

Ver también

ob_start() - Activa el almacenamiento en búfer de la salida
ob_get_length() - Devolver la longitud del búfer de salida

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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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