Redirecting output into STDERR in PHP console script

Published on May 19, 2010 at 12 pm by Aleksandr Tsertkov

Recently I needed to send output from PHP console script into STDERR instead of STDOUT. Usually you would do it with an I/O redirection “COMMAND >&2″, but in this case it was not possible. A solution was pretty easy though – output buffer callback function which were redirecting output into STDERR and returning zero output for STDOUT.

Here is an example:

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/**
 * Output calback function
 * Writes buffer into STDERR instead of STDOUT
 * @link http://de3.php.net/manual/en/function.ob-start.php
 * @param string $output
 * @return string
 */
function SvnHook_outputCallback($output)
{
    fwrite(STDERR, $output);
    return '';
}
 
// set output callback redirecting STDOUT to STDERR
ob_start('SvnHook_outputCallback');
Categories: php
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