Woker-Pool.php Example Not Working

[pentatonicfunk]

I tried running worker-pool.php on examples direcotry,
using version 0.3.0
but the result:

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Read from https://google.com: 0 bytes
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Read from https://icicle.io: 0 bytes
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Read from https://github.com: 0 bytes

tried to change url, still same
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Read from http://challonge.com/: 0 bytes
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Read from http://hotexamples.com: 0 bytes
Read from http://hotexamples.com: 0 bytes