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Post variables disappearing.

Discussion in 'PHP' started by sarahk, May 18, 2020.

  1. #1
    I've got an ajax call that sends two arrays of data. Portals and Stubs.

    The headers look like this:

    portals[630][lat] -36.876755
    portals[630][lng]: 174.767649
    portals[630[photo]: http://lh3.googleusercontent.com/34nlTLv5ueIf4NksgJt5XzpEACGwWPCFqjyj0mgQLJYSJns03-LjzI6nr7fw64cgyfLfgU2OtDnPYG5a58Cxxj6zLa4
    portals[630][name]: Eden Garden
    portals[631][lat]: -36.873148
    portals[631][lng]: 174.761531
    portals[631][photo]: http://lh3.googleusercontent.com/3EsLuaes-vXrvC-lfcA4-va4l8uoiC3uEys28q_7njbfMSpTKrbLsiSrvBSGAYB8lOtRGMGS_--R10GsNSlQ1PTrtw
    portals[631][name]: Gordon House - Wesley Dementia Care
    stubs[0][lat]: -36.865096
    stubs[0][lng]: 174.77066
    stubs[1][lat]: -36.872709
    stubs[1][lng]: 174.766448
    stubs[2][lat]: -36.864204
    stubs[2][lng]: 174.770893
    stubs[3][lat]: -36.875467
    stubs[3][lng]: 174.73618
    stubs[4][lat]: -36.861377
    stubs[4][lng]: 174.769936
    Code (markup):
    in my php script I have

    $portals = filter_input(INPUT_POST, 'portals', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY);
    $stubs = filter_input(INPUT_POST, 'stubs', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY);
    Code (php):
    $portals always has a list
    $stubs sometimes has a list, sometimes it's NULL.
    Even if I have no data, I'll always send an empty array so it should never be NULL

    When I output array_keys($_POST) only shows stubs sometimes which makes me think that it's not a filter_input problem.

    I can't see anything that would indicate why $stubs is failing.

    If I save the post variables to a file it's 192kb
    My hosting settings: post_max_size 8M (Default)
    So that shouldn't be a problem.

    Is there a gotcha with $_POST and arrays that I need to know about?

    Normally by the time I've tried to put down all the relevant info in a query I've found the thing I've tripped over. Not this time. I don't normally work with such large amounts of data but it's really not that much, surely.

    EDIT: I've found my culprit!

    in my PHP settings I have max_input_vars = 1000 which means it's been dropping off large portions of even the Portals array and explains a weird bug I hadn't worked my way through to.

    So being on shared hosting I can't just dive into php.ini

    I've added this to my .htaccess and will keep an eye on it.
    SEMrush
    <IfModule mod_php7.c>
    
    php_value max_input_vars 5000
    
    </IfModule>
    Code (markup):
     
    Last edited: May 18, 2020
    sarahk, May 18, 2020 IP
    JEET likes this.
    SEMrush
  2. JEET

    JEET Notable Member

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    #2
    Why don't you serialize and then base64 encode your 2 arrays and send as 1 single input var? Then on receiving end, you can decode unserialize and do your rest of processing. I read on stackoverflow that increasing input vars like this can leave the server vulnerable to service denial attacks.
     
    JEET, May 19, 2020 IP
  3. sarahk

    sarahk iTamer Staff

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    #3
    That would work, instead I've just batched it up and made additional calls.
    Not as tidy but it does the trick.
     
    sarahk, May 19, 2020 IP
    JEET likes this.
  4. deathshadow

    deathshadow Acclaimed Member

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    #4
    Screw the dipshit parody of 1960's computing that is base64...

    Send it as one field as JSON. If this is JavaScript -- since @sarahk said AJAX -- USE IT!!! Data like this is precisely why formats like JSON and XML exist.
     
    deathshadow, May 21, 2020 IP
    JEET likes this.