test-composer-output.php

<?php

if (file_exists('composer')) {
    unlink('composer');
}

file_put_contents('composer', file_get_contents('https://getcomposer.org/download/1.0.0-alpha10/composer.phar'));
chmod('composer', 0777);

file_put_contents('composer.json', <<<EOF
{
    "name": "test/test",
    "require": {
        "symfony/console": "^2.7"
    }
}
EOF
);

$descriptorSpec = array(
    0 => array("pipe", "r"),
    1 => array("pipe", "w"),
    2 => array("pipe", "w")
);

$process = proc_open('composer update', $descriptorSpec, $pipes, getcwd());

foreach ($pipes as $pipe) {
    var_dump(stream_get_contents($pipe));
}

unlink('composer.json');
unlink('composer');


//OUTPUT:
//php test-composer-output.php
//string(0) ""
//string(0) ""
//string(156) "Loading composer repositories with package information
//Updating dependencies (including require-dev)
//Nothing to install or update
//Generating autoload files
//"