How do I see which checkbox is checked

Question

How do I check in PHP whether a checkbox is checked or not

User · Answer

If you don t know which checkboxes your page has  ex  if you are creating them dynamically  you can simply put a hidden field with the same name and 0 value right above the checkbox     lt input type  hidden  name  foo  value  0    gt   lt input type  checkbox  name  foo  value  1  gt    This way you will get 1 or 0 based on whether the checkbox is selected or not

User · Answer

If the checkbox is checked  then the checkbox s value will be passed  Otherwise  the field is not passed in the HTTP post   if  isset   POST  mycheckbox           echo  checked

User · Answer

I love short hands so    isChecked   isset   POST  myCheckbox       yes     no

User · Answer

Try this      index html   lt form action  form php  method  post  gt      Do you like stackoverflow       lt input type  checkbox  name  like  value  Yes    gt         lt input type  submit  name  formSubmit  value  Submit    gt    lt  form gt    form php   lt html gt   lt head gt   lt  head gt   lt body gt    lt  php     if isset   POST  like                   echo   lt h1 gt You like Stackoverflow  lt h1 gt              else               echo   lt h1 gt You don t like Stackoverflow  lt  h1 gt               gt    lt  body gt   lt  html gt    Or this    lt  php     if isset   POST  like      amp  amp         POST  like       Yes                  echo  You like Stackoverflow              else               echo  You don t like Stackoverflow               gt

User · Answer

you can check that by either isset   or empty    its check explicit isset  weather check box is checked or not   for example      lt input type  checkbox  name  Mary  value  2  id  checkbox    gt    here you can check by   if  isset   POST  Mary           echo  checked        or  if   empty   POST  Mary           echo  checked        the above will check only one if you want to do for many than you can make an array instead writing separate for all checkbox try like    lt input type  checkbox  name  formDoor    value  A    gt Acorn Building lt br   gt   lt input type  checkbox  name  formDoor    value  B    gt Brown Hall lt br   gt   lt input type  checkbox  name  formDoor    value  C    gt Carnegie Complex lt br   gt    php     aDoor     POST  formDoor      if empty  aDoor           echo  You didn t select any buildings           else          N   count  aDoor       echo  You selected  N door s           for  i 0   i  lt   N   i                echo htmlspecialchars  aDoor  i

[php] How do I see which checkbox is checked?

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