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Input/Output
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How does one access standard input/output and error streams in PHP?
STDIN, STDOUT and STDERR constants
Use stdin(), stdout() and stderr() functions
PHP::STDIN, PHP::STDOUT and PHP::STDERR class constants
Use PHP::stdin(), PHP::stdout() and PHP::stderr() class functions
STDIN, STDOUT and STDERR constants
Correct: STDIN, STDOUT and STDERR constants
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