问题描述
echo 是否等于 fputs(STDOUT)，或者 echo 是否写入不同的流?我已经使用 PHP 一段时间了，但我不太清楚在较低级别上实际发生了什么.
Does echo equal fputs( STDOUT ), or does echo write to a different stream? I've used PHP for a while now, but I don't know very well what's actually happening on a lower level.
推荐答案
根据 PHP 的包装器手册页，答案是否定的.
According to PHP's manual page on wrappers, the answer is No.
php://输出
php://output 是一个只写流，允许您写入输出缓冲机制与print()和echo()相同.
php://output is a write-only stream that allows you to write to the output buffer mechanism in the same way as print() and echo().
print 和 echo 写入 php://output 流，而 fputs(STDOUT) 写入到php://stdout.
print and echo write to php://output stream, whereas fputs(STDOUT) writes to php://stdout.
我做了一个小测试:
<?php
$output = fopen('php://output', 'w');
ob_start();
echo "regular echo
";
fwrite(STDOUT, "writing to stdout directly
");
fwrite($output, "writing to php://output directly
");
$ob_contents = ob_get_clean();
print "ob_contents: $ob_contents
";
此脚本输出(在 PHP 5.2.13、windows 上测试):
This script outputs (tested on PHP 5.2.13, windows):
writing to stdout directly
ob_contents: regular echo
writing to php://output directly
即写入 STDOUT 直接绕过 ob 处理程序.
i.e. writing to STDOUT directly bypasses ob handlers.
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