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Editorial Team
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Asked: 2026-05-21T18:37:51+00:00

I am experiencing a very odd behaviour. Say I have the following two <input

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I am experiencing a very odd behaviour. Say I have the following two <input type='image'> (with the src attribute equal to the name attribute):

<input type='image' name='http://farm1.static.flickr.com/224/471627793_fbda6cecbe_s.jpg'>
<input type='image' name='http://farm5.static.flickr.com/4053/4501238330_c5a85162ef_s.jpg'>

My question is: why does the first input submit and the second one doesn’t? I am using CakePHP and if I click on the second image, the $this->params['form'] is empty. But when I click on the first image, everything works fine: the $this->params['form'] contains the correct image name together with it’s coordinates from where it was clicked.

This is a very odd behaviour and I believe that this can only happen if $_POST limit its keys’ length.

Any help is highly appreciated! Thank you!

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1 Answer

  1. Editorial Team

    PHP itself does not limit field name length for multipart/ or -urlencoded POST requests.

    But suhosin does indeed have http://www.hardened-php.net/suhosin/configuration.html#suhosin.post.max_name_length with a default of 64. And your second url is indeed 64 characters long.

    Less likely, but also possible is a mod_security setup. It would however spill an error message rather than truncating.

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