php PHP标准输入？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/554760/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
PHP standard input?
提问by Chris Lutz
I know PHP is usually used for web development, where there isno standard input, but PHP claims to be usable as a general-purpose scripting language, if you do follow it's funky web-based conventions. I know that PHP prints to stdout(or whatever you want to call it) with printand echo, which is simple enough, but I'm wondering how a PHP script might get input from stdin(specifically with fgetc(), but any input function is good), or is this even possible?
我知道PHP通常用于web开发，那里是没有标准的输入，但是PHP声称是可用作通用脚本语言，如果你遵循它的古怪基于web的约定。我知道 PHPstdout使用printand打印到（或您想调用的任何内容）echo，这很简单，但我想知道 PHP 脚本如何从stdin（特别是使用fgetc()，但任何输入函数都很好）获取输入，或者是这甚至可能吗？
回答by Patrick Glandien
It is possible to read the stdinby creating a file handle to php://stdinand then read from it with fgets()for a line for example (or, as you already stated, fgetc()for a single character):
可以stdin通过创建一个文件句柄来php://stdin读取它，然后用fgets()一行读取它（或者，正如你已经说过的，fgetc()对于单个字符）：
<?php
$f = fopen( 'php://stdin', 'r' );
while( $line = fgets( $f ) ) {
echo $line;
}
fclose( $f );
?>
回答by anatoly techtonik
Reading from STDINis recommended way
从STDIN读取是推荐的方式
<?php
while (FALSE !== ($line = fgets(STDIN))) {
echo $line;
}
?>
回答by mjs
To avoid having to mess around with filehandles, use file_get_contents()and php://stdin:
为避免弄乱文件句柄，请使用file_get_contents()和php://stdin：
$ echo 'Hello, World!' | php -r 'echo file_get_contents("php://stdin");'
Hello, World!
(If you're reading a truly huge amount of data from stdinyou might want to use the filehandle approach, but this should be good for many megabytes.)
（如果您正在从真正大量的数据中读取数据，stdin您可能想要使用文件句柄方法，但这对于多兆字节来说应该是有好处的。）
回答by Muhammad Usman
A simple method is
一个简单的方法是
$var = trim(fgets(STDIN));
回答by redolent
Grab it all in one shot:
一枪搞定：
$contents = file_get_contents("php://stdin");
echo $contents;
回答by Fritz H
IIRC, you may also use the following:
IIRC，您还可以使用以下内容：
$in = fopen(STDIN, "r");
$out = fopen(STDOUT, "w");
Technically the same, but a little cleaner syntax-wise.
技术上相同，但在语法上更简洁一些。
回答by Richard Cross
This also works:
这也有效：
$data = stream_get_contents(STDIN);
回答by NVRM
When using fgets, it may block in bash scripts, if the stdinisn't set or empty, including while using the @php error control operator.
使用 fgets 时，它可能会阻塞 bash 脚本，如果stdin未设置或为空，包括在使用@php 错误控制运算符时。
#!/usr/bin/php
<?php
$pipe = @trim(fgets(STDIN));
// Script was called with an empty stdin
// Fail to continue, php warning
This behavior can be avoided by setting stream_set_blockingon the php header:
可以通过stream_set_blocking在 php 标头上设置来避免这种行为：
#!/usr/bin/php
<?php
stream_set_blocking(STDIN, 0);
$pipe = @trim(fgets(STDIN));
// Script was called with an empty stdin
// No errors or warnings, continue
echo $pipe . "!";
As example, to be called as follow:
例如，调用如下：
echo "Hello world" | ./myPHPscript
// Output "Hello world!"
./myPHPscript
// Output "!"
回答by Donovan P
Instead of manually opening STDIN stream, use built in readline() function if you just want to read a single line without too much a hassle :
如果您只想读取一行而不会太麻烦，请使用内置的 readline() 函数，而不是手动打开 STDIN 流：
<?php
$age= readline("Enter your age: ");
echo "Your age is : ".$age;
PHP documentation is your friend : https://www.php.net/manual/en/function.readline.php
PHP 文档是您的朋友：https: //www.php.net/manual/en/function.readline.php
