PHP isset with multiple parameters

Question

I m trying to work with AJAX autocompletes and I am having a few problems with getting the two languages to work in synergy   When I replace all the issets with only 1   POST the snippet below will work  however by adding another   POST I get an error on line 5    lt  php   require once     Configuration php   if  isset   POST  search term       POST  postcode       true  amp  amp  empty    POST  search term       POST  postcode       false     search term   mysql real escape string   POST  search term       POST  postcode      query   mysql query  SELECT  customer name   postcode  FROM  Customers  WHERE  customer name  LIKE   search term       while   row   mysql fetch assoc  query       false          loop     echo   lt li gt    row  customer name      row  postcode     lt  li gt            gt    Any advice on why it is throwing this error would be much appreciated  Thanks   I understand I should be using mysqli  I am just trying to get the logic first     Js   Primary js     document  ready function         autosuggest   keyup function          var search term     this  attr  value        var postcode     GET  postcode          alert search term   takes what is typed in the input and alerts it       post  ajax search php    search term search term  postcode postcode       function  data                result   html data               result li   click function                 var result value     this  text                    autosuggest   attr  value   result value                   result   html

User · Answer

Use the php s OR      logical operator for php isset   with multiple operator e g  if  isset   POST  room          POST  cottage          POST  villa

User · Answer

The parameters of isset   should be separated by a comma sign     and not a dot sign      Your current code concatenates the variables into a single parameter  instead of passing them as separate parameters   So the original code evaluates the variables as a unified string value   isset   POST  search term       POST  postcode       Incorrect   While the correct form evaluates them separately as variables   isset   POST  search term      POST  postcode       Correct

User · Answer

You just need   if   empty   POST  search term     amp  amp   empty   POST  postcode       isset  amp  amp   empty is redundant

User · Answer

The parameter s  to isset   must be a variable reference and not an expression  in your case a concatenation   but you can group multiple conditions together like this   if  isset   POST  search term      POST  postcode           This will return true only if all arguments to isset   are set and do not contain null   Note that isset  var  and isset  var     true have the same effect  so the latter is somewhat redundant   Update  The second part of your expression uses empty   like this   empty    POST  search term       POST  postcode       false   This is wrong for the same reasons as above  In fact  you don t need empty   here  because by that time you would have already checked whether the variables are set  so you can shortcut the complete expression like so   isset   POST  search term      POST  postcode     amp  amp         POST  search term    amp  amp         POST  postcode     Or using an equivalent expression    empty   POST  search term     amp  amp   empty   POST  postcode      Final thoughts  You should consider using filter functions to manage the inputs    data   filter input array INPUT POST  array       search term    gt  array           filter    gt  FILTER UNSAFE RAW           flags    gt  FILTER NULL ON FAILURE              postcode    gt  array           filter    gt  FILTER UNSAFE RAW           flags    gt  FILTER NULL ON FAILURE              if   data     null    in array null   data  true            some fields are missing or their values didn t pass the filter     die  You did something naughty           data  search term   and  data  postcode   contains the fields you want   Btw  you can customize your filters to check for various parts of the submitted values

[php] PHP isset() with multiple parameters

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