[PHP-DEV] Re: output buffering callback limitation

[Andre Cerqueira]

maybe php.general would be more appropriate

im not a developer, but i think this "feature" doesnt make sense hehe
i think ob display handlers are not supposed to output things directly, they just return them to the function that will output it

at your first snip, you could/should do:

<?php
function ob_perso_handler($buffer)
{
        $buffer = 'foo'. $buffer; //you already received output data
        return $buffer;
}
ob_start('ob_perso_handler');
echo 'Hello World !';
?>

at the second:

<?php
function ob_perso_handler1($buffer)
{
        return $buffer .'f1';
}

function ob_perso_handler2($buffer)
{
        return 'foo'. $buffer .'f2';
}

ob_start('ob_perso_handler1');
ob_start('ob_perso_handler2');

echo 'Hello World !';
?>

good luck on the killer appz

Okin okin wrote:

Hi,

I'm having trouble with output buffering limitation
and the output_callback function of ob_start.

look at this script :

<?php

function ob_perso_handler($buffer)
{
        ob_start();
        echo 'foo';
        $buffer .= ob_get_contents();
        ob_end_clean();
        
        return $buffer;
}

ob_start('ob_perso_handler');

echo 'Hello World !';

?>

it outputs : "Fatal error: ob_start(): Cannot use
output buffering in output buffering display handlers"

Why then ? It would be a killer  feature for my next
killer appz !

I've tried also :

<?php

function ob_perso_handler1($buffer)
{
        return $buffer . 'f1';
}

function ob_perso_handler2($buffer)
{
        ?>
        foo
        <?
        
        return $buffer . 'f2';
}

ob_start('ob_perso_handler1');
ob_start('ob_perso_handler2');

echo 'Hello World !';

?>

but were does "foo" go ?

any idea on that ? maybe some source change to PHP to
permit one or the other solution ?

I'm new to this mailing list, please redirect me to
the correct one if I'm wrong here. My thought was it
was a developper problem, since change to the source
has to be done to enable such this feature ...

Many thank's for any help !

Nikos

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