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このドキュメントでは、 php中国語ネットマニュアル リリース
[#1] list2011 at lunch dot za dot net [2012-02-02 10:11:54]
When readline is enabled, php switches the terminal mode to accept line-buffered input. This means that the proper way to use the cli when you pipe to an interactive command is to explicitly specify that php is not using the terminal for input:
php somescript.php < /dev/null | less