(PHP 4, PHP 5, PHP 7, PHP 8)
ob_get_contents — Retorna o conteúdo do buffer de saída
Esta função não possui parâmetros.
Retorna o conteúdo do buffer de saída ou false, se o buffer
de saída não estiver ativo.
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"
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, $out2);
?>Note that, unlike PHP variables which make efficient use of memory, getting the contents of the output buffer results in a new copy of the buffer being made. This can end up massively increasing the memory requirements of your script if your output is large.
Example code:
<?php
print(memory_get_usage() . "<br>");
ob_start();
for ($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