How to read if a checkbox is checked in PHP

Question

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Learn about isset which is a built in  function  that can be used in if statements to tell if a variable has been used or set  Example       if isset   POST  testvariabel                   echo  testvariabel has been set

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filter input INPUT POST   checkbox name   FILTER DEFAULT  FILTER FORCE ARRAY

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A minimalistic boolean check with switch position retaining   lt  php   checked      POST  foo        checked       gt    lt input type  checkbox  name  foo  value   checked  lt     POST  foo    gt  gt

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Well  the above examples work only when you want to INSERT a value  not useful for UPDATE different values to different columns  so here is my little trick to update      EMPTY ALL VALUES TO 0   queryMU   UPDATE    db- dbprefix    settings SET menu news   0  menu gallery   0  menu events   0  menu contact   0                stmtMU    db- prepare  queryMU                stmtMU- execute    if  empty   POST  check menus           foreach   POST  check menus   as  checkU    try     UPDATE only the values checked      queryMU   UPDATE    db- dbprefix    settings SET    checkU    1                stmtMU    db- prepare  queryMU                stmtMU- execute                catch PDOException  e               msg    Error       e- getMessage                     lt input type  checkbox  value  menu news  name  check menus      gt   lt input type  checkbox  value  menu gallery  name  check menus      gt          The secret is just update all VALUES first  in this case to 0   and since the  will only send the checked values  that means everything you get should be set to 1  so everything you get set it to 1   Example is PHP but applies for everything   Have fun

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lt  php    if  isset   POST  add             nama          POST  name         subscribe   isset   POST  subscribe        POST  subscribe      Not Checked        echo  Name    nama   lt br   gt        echo  Subscribe    subscribe         echo   lt hr   gt               gt    lt form action   lt  php echo htmlspecialchars   SERVER  PHP SELF      gt   method  POST   gt      lt input type  text  name  name    gt   lt br   gt     lt input type  checkbox  name  subscribe  value  news    gt  News  lt br   gt      lt input type  submit  name  add  value  Save    gt    lt  form gt

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Wordpress have the checked   function  Reference  https   developer wordpress org reference functions checked   checked  mixed  checked  mixed  current   true  bool  echo   true     Description Compares the first two arguments and if identical marks as checked  Parameters  checked  mixed   Required  One of the values to compare   current  mixed   Optional   true  The other value to compare if not just true Default value  true   echo  bool   Optional  Whether to echo or just return the string Default value  true  Return  Return  string  html attribute or empty string

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lt  php  if isset   POST  nameCheckbox            SESSION  fr nameCheckbox     true       gt    lt input type  checkbox  name  nameCheckbox     lt  php   if isset   SESSION  fr nameCheckbox          echo  checked        unset   SESSION  fr nameCheckbox           gt

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in BS3 you can put     lt  php                    checked  hola                      exenta    datosOrdenCompra 0   exenta                      var dump  datosOrdenCompra 0   exenta                       if isset  datosOrdenCompra 0   exenta    and  datosOrdenCompra 0   exenta      1                           checked  on                       else                       checked  off                                        gt                 lt input type  checkbox  id  exenta  name  exenta   lt  php echo  checked   gt   gt   lt span class  label-text  gt  Exenta lt  span gt    Please Note the usage of isset  datosOrdenCompra 0   exenta

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You can check the corresponding value as being set and non-empty in either the   POST or   GET array depending on your form s action   i e   With a POST form using a name of  test   i e    lt input type  checkbox  name  test  gt    you d use   if isset   POST  test            The checkbox was enabled

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check value   isset   POST  my checkbox name      1   0

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When using checkboxes as an array    lt input type  checkbox  name  food    value  Orange  gt   lt input type  checkbox  name  food    value  Apple  gt    You should use in array     if in array  Orange     POST  food        echo  Orange was checked        Remember to check the array is set first  such as   if isset   POST  food     amp  amp  in array

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If your HTML page looks like this      lt input type  checkbox  name  test  value  value1  gt    After submitting the form you can check it with     isset   POST  test      or    if    POST  test       value1

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is checked   isset   POST  your checkbox name     amp  amp                  POST  your checkbox name       on     Short circuit evaluation will take care so that you don t access your checkbox name when it was not submitted

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Zend Framework use a nice hack on checkboxes  which you can also do yourself    Every checkbox generated is associated with a hidden field of the same name  placed just before the checkbox  and with a value of  0   Then if your checkbox as the value  1   you ll always get the  0  or  1  value in the resulting GET or POST   lt input type  hidden  name  foo  value  0    gt   lt input type  checkbox  name  foo  value  1  gt

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To check if a checkbox is checked use empty    When the form is submitted  the checkbox will ALWAYS be set  because ALL POST variables will be sent with the form   Check if checkbox is checked with empty as followed     Check if checkbox is checked     if  empty   POST  checkbox        Checkbox selected code   else     Checkbox not selected code

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You can do it with the short if    check value   isset   POST  my checkbox name      1   0    or with the new PHP7 Null coalescing operator   check value     POST  my checkbox name      0

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lt form gt   lt input type  quot check quot  id chk1 value  quot 1 quot  gt   lt input type  quot check quot  id chk2 value  quot 1 quot  gt   lt input type  quot check quot  id chk3 value  quot 1 quot  gt   lt  form gt   when you check on chk2 you can see values as   lt  php foreach   POST as  key  gt  value        if isset  key             key strip tags  value     insert into table  chk1 chk2 chk3  values      1         gt

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I ve been using this trick for several years and it works perfectly without any problem for checked unchecked checkbox status while using with PHP and Database   HTML Code   for Add Page    lt input name  status  type  checkbox  value  1  checked gt    Hint  remove  checkbox  if you want to show it as unchecked by default  HTML Code   for Edit Page    lt input name  status  type  checkbox  value  1    lt  php if   row  status      1    echo  checked  checked        gt  gt    PHP Code   use for Add Edit pages    status     POST  status    if   status    1     status   1    else    status   0      Hint  There will always be empty value unless user checked it  So  we already have PHP code to catch it else keep the value to 0  Then  simply use the  status variable for database

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Let your html for your checkbox will be like   lt input type  checkbox  name  check1  gt    Then after submitting your form you need to check like  if  isset   POST  check1               Checkbox is selected   else          Alternate code     Assuming that check1 should be your checkbox name And if your form submitting method is GET then you need to check with   GET variables like  if  isset   GET  check1              Checkbox is selected

[php] How to read if a checkbox is checked in PHP?

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