ext-uv/examples/spawn_fd.php

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PHP
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<?php
$in = uv_pipe_init(uv_default_loop(), true);
echo "HELLO ";
$stdio = array();
$stdio[] = uv_stdio_new($in, UV::CREATE_PIPE | UV::READABLE_PIPE);
$fp = fopen("php://stdout", "w");
$stdio[] = uv_stdio_new($fp, UV::INHERIT_FD | UV::WRITABLE_PIPE);
$flags = 0;
uv_spawn(uv_default_loop(), "php", array('-r','var_dump($_ENV);'), $stdio, "/usr/bin/",
array("key"=>"hello"),
function($process, $stat, $signal){
uv_close($process,function(){});
}, $flags);
uv_run();