Define constant in a different namespace php

Question

Here's what I was doing in the past

//file: bar.php
defined('MYC') or define('MYC', 'val1');
//file: bootstrap.php
define('MYC', 'val2');

I would include bootstrap.php first which would set MYC = 'val2'.
Now bar.php is in the \Foo\Bar namespace, i.e. to say

//file: bar.php
namespace Foo\Bar;
defined('MYC') or define('MYC', 'val1');
//file: bootstrap.php
//following doesn't work
//const \Foo\Bar\MYC = 'val2';
//?? what do I do here ??

You code should still work regardless of namespace because define() function defines global constants, they are visible in any namespace. — Dmitri Snytkine
– Dmitri Snytkine, Commented Oct 31, 2011 at 12:53
thanks, I got that by experimenting, and I also figured I can't do conditional const MYC = 'val1'; in namespace Foo\Bar; so I guess I will have to live with shitty_long_namespaced_global_constant_names :( — wadkar
– wadkar, Commented Oct 31, 2011 at 13:11
define() isn't namespace aware. You'd have to do define (__NAMESPACE__ . '\CONST_IN_NAME_SPACE') to get it to create a constant in the current namespace. Alternatively, you can use const if you don't have to calculate the value of the constant before defining it. — GordonM
– GordonM, Commented Nov 2, 2013 at 9:24

Daniel A. White · Accepted Answer · 2011-10-31 12:47:08Z

1

Just define the key to have the namespace in the name.

answered Oct 31, 2011 at 12:47

Daniel A. White

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2 Comments

wadkar Over a year ago

do these constants defined by define() always land up in global namespace ? it looks like so, let me dig in and report back

wadkar Over a year ago

looks like, define('MYC1', 'val1') in any namespace is MYC1 constant, where as const MYC2 in namespace Foo\Bar is actually \Foo\Bar\MYC2 , and there is no way I can do const \Foo\Bar\MYC2 outside \Foo\Bar, so all that jazz about constants within their own namespace is NOT going to work for me :(

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