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putenv

(PHP 4, PHP 5, PHP 7, PHP 8)

putenv设置环境变量的值

说明

putenv(string $assignment): bool

添加 assignment 到服务器环境变量。 环境变量仅存活于当前请求期间。 在请求结束时环境会恢复到初始状态。

参数

assignment

设置,例如 "FOO=BAR"

返回值

成功时返回 true, 或者在失败时返回 false

示例

示例 #1 设置一个环境变量

<?php
putenv
("UNIQID=$uniqid");
?>

参见

添加备注

用户贡献的备注 6 notes

up
74
php at keith tyler dot com
14 years ago
putenv/getenv, $_ENV, and phpinfo(INFO_ENVIRONMENT) are three completely distinct environment stores. doing putenv("x=y") does not affect $_ENV; but also doing $_ENV["x"]="y" likewise does not affect getenv("x"). And neither affect what is returned in phpinfo().

Assuming the USER environment variable is defined as "dave" before running the following:

<?php
print "env is: ".$_ENV["USER"]."\n";
print
"(doing: putenv fred)\n";
putenv("USER=fred");
print
"env is: ".$_ENV["USER"]."\n";
print
"getenv is: ".getenv("USER")."\n";
print
"(doing: set _env barney)\n";
$_ENV["USER"]="barney";
print
"getenv is: ".getenv("USER")."\n";
print
"env is: ".$_ENV["USER"]."\n";
phpinfo(INFO_ENVIRONMENT);
?>

prints:

env is: dave
(doing: putenv fred)
env is: dave
getenv is: fred
(doing: set _env barney)
getenv is: fred
env is: barney
phpinfo()

Environment

Variable => Value
...
USER => dave
...
up
35
JM
17 years ago
The other problem with the code from av01 at bugfix dot cc is that
the behaviour is as per the comments here, not there:
<?php
putenv
('MYVAR='); // set MYVAR to an empty value. It is in the environment
putenv('MYVAR'); // unset MYVAR. It is removed from the environment
?>
up
4
domger at freenet dot de
1 year ago
Values of variables with dots in their names are not output when using getenv(), but are still present and can be explicitly queried.

(saw this behaviour using PHP 8.2.4)

<?php

// set
putenv('foo.bar=baz');

// dump all
var_dump(getenv()); # <== variable 'foo.bar' NOT included, its value is not dumped

// dump explicitely 'foo.bar'
var_dump(getenv('foo.bar')); # works, value 'baz' is shown
up
10
t7to7
5 years ago
White spaces are allowed in environment variable names so :

<?php
putenv
('U =33');
?>

Is not equivalent to

<?php
putenv
('U=33');
?>
up
12
david dot boyce at messagingdirect dot comnospam
24 years ago
Environment variables are part of the underlying operating system's
way of doing things, and are used to pass information between a parent
process and its child, as well as to affect the way some internal
functions behave. They should not be regarded as ordinary PHP
variables.

A primary purpose of setting environment variables in a PHP script is
so that they are available to processes invoked by that script using
e.g. the system() function, and it's unlikely that they would need to
be changed for other reasons.

For example, if a particular system command required a special value
of the environment variable LD_LIBRARY_PATH to execute successfully,
then the following code might be used on a *NIX system:

<?php
$saved
= getenv("LD_LIBRARY_PATH"); // save old value
$newld = "/extra/library/dir:/another/path/to/lib"; // extra paths to add
if ($saved) { $newld .= ":$saved"; } // append old paths if any
putenv("LD_LIBRARY_PATH=$newld"); // set new value
system("mycommand -with args"); // do system command;
// mycommand is loaded using
// libs in the new path list
putenv("LD_LIBRARY_PATH=$saved"); // restore old value
?>

It will usually be appropriate to restore the old value after use;
LD_LIBRARY_PATH is a particularly good example of a variable which it
is important to restore immediately, as it is used by internal
functions.

If php.ini configuration allows, the values of environment variables
are made available as PHP global variables on entry to a script, but
these global variables are merely copies and do not track the actual
environment variables once the script is entered. Changing
$REMOTE_ADDR (or even $HTTP_ENV_VARS["REMOTE_ADDR"]) should not be
expected to affect the actual environment variable; this is why
putenv() is needed.

Finally, do not rely on environment variables maintaining the same
value from one script invocation to the next, especially if you have
used putenv(). The result depends on many factors, such as CGI vs
apache module, and the exact way in which the environment is
manipulated before entering the script.
up
7
Anonymous Coder
12 years ago
It's the putenv() type of environment variables that get passed to a child process executed via exec().

If you need to delete an existing environment variable so the child process does not see it, use:

putenv('FOOBAR');

That is, leave out both the "=" and a value.
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