stdin / stdout / stderr

[TOC] ## php://stdout ``` $fp = fopen("php://stdout",'r'); fwrite($fp,"world\n"); ``` ## php://stderr ``` $fp = fopen("php://stderr",'r'); fwrite($fp,"hello\n"); ``` ## php://stdint ``` $fp = fopen("php://stdin",'w'); var_dump(fread($fp,10)); ```