Can a namespace start with a number in PHP?

Question

When declaring the following namespace:

<?php namespace Example\3000;

I got this error:

Parse error: syntax error, unexpected '3000' (T_LNUMBER), expecting identifier (T_STRING) in [...]

So I wondered whether a namespace in PHP may start with a number?

hielsnoppe · Accepted Answer · 2015-11-23 16:04:05Z

20

No, it must not. It must start with a letter.

It took me a while to find this in a comment on PHP.net.

To use numbers e.g. for versioning it is necessary to prepend letters, e.g. like in the following:

<?php namespace Example\V_3000;

answered Nov 23, 2015 at 16:04

hielsnoppe

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2 Comments

Flosculus Over a year ago

Mate, I would have just said "No".

instead Over a year ago

Did You.. answered just after asking?

Rich R · Accepted Answer · 2018-03-05 19:36:26Z

Note: Special character cannot be used. The only special character I have found that works is the underscore (_). For example if you want a folder for version 3.0.01, then do the following:

 <?php namespace Example\v3_0_01;

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