Demo has incorrect command... about phpspy

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Either of those commands should work, although -r with no argument is a no-op. I will update those docs. There is a potential race condition if the PHP process finishes before phpspy tries to attach.

The popen_read_line error is expected and recoverable if the PHP binary does not contain debug symbols.

adam@asx1c6:~/phpspy$ ./phpspy -- php -r 'usleep(100000);'
0 usleep <internal>:-1
1 <main> <internal>:-1

0 usleep <internal>:-1
1 <main> <internal>:-1

0 usleep <internal>:-1
1 <main> <internal>:-1

0 usleep <internal>:-1
1 <main> <internal>:-1

0 usleep <internal>:-1
1 <main> <internal>:-1

0 usleep <internal>:-1
1 <main> <internal>:-1

0 usleep <internal>:-1
1 <main> <internal>:-1

process_vm_readv: No such process
adam@asx1c6:~/phpspy$ ./phpspy -r qcup -- php -r 'usleep(100000);'
0 usleep <internal>:-1
1 <main> <internal>:-1
# uri = -
# path = Standard input code
# qstring = -
# cookie = -
# ts = 1575925866.473734

0 usleep <internal>:-1
1 <main> <internal>:-1
# uri = -
# path = Standard input code
# qstring = -
# cookie = -
# ts = 1575925866.473734

0 usleep <internal>:-1
1 <main> <internal>:-1
# uri = -
# path = Standard input code
# qstring = -
# cookie = -
# ts = 1575925866.473734

0 usleep <internal>:-1
1 <main> <internal>:-1
# uri = -
# path = Standard input code
# qstring = -
# cookie = -
# ts = 1575925866.473734

0 usleep <internal>:-1
1 <main> <internal>:-1
# uri = -
# path = Standard input code
# qstring = -
# cookie = -
# ts = 1575925866.473734

process_vm_readv: No such process