php - IF statement inside FOR Loop returns false results -


i have few days started studying php , have following code, makes 3 check-boxes , 3 drop-down lists accordingly(could more, that's not issue).

the idea custom mysql query string created more 1 conditions. drop-down lists contain db fields. user decide how many custom conditions add clicking these check-boxes , setting value in drop-down list.

after clicking submit button every checkbox checked , if value according drop-down box set, value drop-down list read. code works , returns correct results (values drop-down lists) if or first checkbox are/is checked. example if second or third checkbox check , value drop-down list set, if statement ignores it. there wrong if statement (in specific && condition) inside loop can can fix it?. additionally, if have 1 condition in if statement results correct!.

<?php     echo <<<_query     <form action="check_array.php" method="post">     query1<input type="checkbox" name="query[]" value="query0">     query2<input type="checkbox" name="query[]" value="query1">     query3<input type="checkbox" name="query[]" value="query2">      fields0     <select name="fields[]">     <option selected value="null">select field</option>     <option value="author">author</option>     <option value="title">title</option>     <option value="category">category</option>     </select>      fields1     <select name="fields[]">     <option selected value="null">select field</option>     <option value="author">author</option>     <option value="title">title</option>     <option value="category">category</option>     </select>      fields2     <select name="fields[]">     <option selected value="null">select field</option>     <option value="author">author</option>     <option value="title">title</option>     <option value="category">category</option></form>     </select>      <input type="submit" name="submit" value="check"></form>     _query;      ($i=0;$i<3;++$i)     {         if (isset($_post["query"][$i]) && $_post["fields"][$i] !="null")         {             echo $_post["query"][$i] ."<br>".$_post["fields"][$i]."<br>";         }     }        ?>

the browser doesn't submit checkboxes unchecked , array indexes query[] being thrown off time there gap in sequence of selected checkboxes. can fix specifying array indexes checkboxes.

change

query1<input type="checkbox" name="query[]" value="query0"> query2<input type="checkbox" name="query[]" value="query1"> query3<input type="checkbox" name="query[]" value="query2">

to

query1<input type="checkbox" name="query[0]" value="query0"> query2<input type="checkbox" name="query[1]" value="query1"> query3<input type="checkbox" name="query[2]" value="query2">

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