Does $_POST have a size limit?

Question

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What is the size limit of a post request?

Does $_POST when used in conjunction with forms in PHP have a size limit? Obviously there must be some restrictions with $_GET seeing as most browsers will start to complain at ~250 characters (or something like that) and data could be lost, obviously this restraint doesn't apply to $_POST.

I could test it myself but thought it might be quicker to simply ask here. If I had a simple form with a textarea, how much data could I enter before I ran into problems?

you could google `post size limit` and it would be even faster — Your Common Sense, Sep 23 '11 at 14:04
@Col. Shrapnel as a lonewolf developer I thought I'd opt for what I consider to be my daily dose of human interaction via the stackexchange. :D — Anonymous, Sep 23 '11 at 14:13
@Downvoters ...a bit over the top, it's a perfectly valid question that hasn't been asked that many times (though now I look, granted, a few). — Anonymous, Sep 23 '11 at 14:15
Don't you have a bit more intelligent question that require some discussion and cannot be solved by five-second googling for the socialization? Your excuse seems weak to me. I'd say it's mere laziness — Your Common Sense, Sep 23 '11 at 15:50
Maybe so, but I think I'm allowed the odd spate of laziness given the extensive idiot-proofing that is involved in programming. :) — Anonymous, Sep 23 '11 at 15:59
@YourCommonSense Oddly enough, this is the first result when I Google "$_POST limitations".... — Kenny Johnson, Jun 20 '13 at 15:37

knittl · Accepted Answer · 2011-09-23T14:10:52.307

10

That depends on the value of the PHP configuration directive POST_MAX_SIZE which is usually set to 8 MB (~8 million characters).

edited Sep 23 '11 at 14:10

answered Sep 23 '11 at 14:05

knittl

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score 9 · Answer 2 · answered Sep 23 '11 at 14:15

9

Yes it has limitation, you can set the limit from several place:

1., in php.ini

post_max_size="8M"

2., from the .htaccess file, if you have

php_value post_max_size 8M

3., from php side,

ini_set('post_max_size',"8M")

answered Sep 23 '11 at 14:15

Qpi

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the two last options will only work if overriding is enabled in the server – knittl Sep 23 '11 at 14:20

score 6 · Answer 3 · answered Sep 23 '11 at 14:05

6

yes,

you can change limit from php.ini "post_max_size"

answered Sep 23 '11 at 14:05

Nimit Dudani

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score 1 · Answer 4 · answered Sep 23 '11 at 14:05

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It's a PHP ini directive, post_max_size. It defaults to 8MB.

answered Sep 23 '11 at 14:05

Alex Turpin

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score 0 · Answer 5 · answered Sep 23 '11 at 14:05

0

Yes. It's defined in the php.ini file.

answered Sep 23 '11 at 14:05

Rijk

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score 0 · Answer 6 · answered Sep 23 '11 at 14:06

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Yes the POST data is regulated by the post_max_size variable (default to 8M)

answered Sep 23 '11 at 14:06

Mika Andrianarijaona

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Does $_POST have a size limit?

6 Answers6