Variable variables and php









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I'm building a concepts-database for my students. I have made a decision to store the school subjects in one column in the database where a 1 represents that the concept belongs to that subject. A concept can belong to several subjects, hence the strange storing system. I gather the altered subjects from the code shown in the code below. It bothers me that i can't make a loop where the variables change for each row. I have tried. I can get the subjects in an array from my database, but I can't manage to make the variable variables work.



TL;DR: How can I code the subjects in to a loop from my stored subjects, stored in the variable $subjects_short. I tried with



if ($'_POST[' . $subjects_short . ']'== 1)$term_subject .= '1'; else $term_subject .= '0';;


in the loop and I can't get it to work.



if ($_POST['sv']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['en']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ma']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ms']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['bi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['fy']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ke']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['tk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ge']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['re']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hkk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['idh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['mu']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sl']== 1)$term_subject .= '1'; else $term_subject .= '0';;





php loops variables variable-variables







share|improve this question

















  • 2




    Its not a variable variable. Just an variable index. Go with $_POST[$subject_short]
    – DarkBee
    Nov 10 at 23:14










  • I'm not sure how to say this more constructively... if you're going to claim to be a teacher, you really owe it to your students to understand the subject matter a lot better than this. If I saw data design and implementation like that in a code review, the next thing I'd be reviewing would be resumes for potential replacement hires.
    – kungphu
    Nov 10 at 23:37










  • Thanks! Worked like a charm now and my code gets much prettier
    – Björn Andersson
    Nov 10 at 23:59










  • I'm not teaching programming. I teach social sciences. This is my hobby and I could never dream of teaching programming.
    – Björn Andersson
    Nov 11 at 0:02











  • You should use three tables: See How to store an array into mysql?
    – symlink
    Nov 11 at 0:14














up vote
-2
down vote

favorite












I'm building a concepts-database for my students. I have made a decision to store the school subjects in one column in the database where a 1 represents that the concept belongs to that subject. A concept can belong to several subjects, hence the strange storing system. I gather the altered subjects from the code shown in the code below. It bothers me that i can't make a loop where the variables change for each row. I have tried. I can get the subjects in an array from my database, but I can't manage to make the variable variables work.



TL;DR: How can I code the subjects in to a loop from my stored subjects, stored in the variable $subjects_short. I tried with



if ($'_POST[' . $subjects_short . ']'== 1)$term_subject .= '1'; else $term_subject .= '0';;


in the loop and I can't get it to work.



if ($_POST['sv']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['en']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ma']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ms']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['bi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['fy']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ke']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['tk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ge']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['re']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hkk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['idh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['mu']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sl']== 1)$term_subject .= '1'; else $term_subject .= '0';;





php loops variables variable-variables







share|improve this question

















  • 2




    Its not a variable variable. Just an variable index. Go with $_POST[$subject_short]
    – DarkBee
    Nov 10 at 23:14










  • I'm not sure how to say this more constructively... if you're going to claim to be a teacher, you really owe it to your students to understand the subject matter a lot better than this. If I saw data design and implementation like that in a code review, the next thing I'd be reviewing would be resumes for potential replacement hires.
    – kungphu
    Nov 10 at 23:37










  • Thanks! Worked like a charm now and my code gets much prettier
    – Björn Andersson
    Nov 10 at 23:59










  • I'm not teaching programming. I teach social sciences. This is my hobby and I could never dream of teaching programming.
    – Björn Andersson
    Nov 11 at 0:02











  • You should use three tables: See How to store an array into mysql?
    – symlink
    Nov 11 at 0:14












up vote
-2
down vote

favorite









up vote
-2
down vote

favorite











I'm building a concepts-database for my students. I have made a decision to store the school subjects in one column in the database where a 1 represents that the concept belongs to that subject. A concept can belong to several subjects, hence the strange storing system. I gather the altered subjects from the code shown in the code below. It bothers me that i can't make a loop where the variables change for each row. I have tried. I can get the subjects in an array from my database, but I can't manage to make the variable variables work.



TL;DR: How can I code the subjects in to a loop from my stored subjects, stored in the variable $subjects_short. I tried with



if ($'_POST[' . $subjects_short . ']'== 1)$term_subject .= '1'; else $term_subject .= '0';;


in the loop and I can't get it to work.



if ($_POST['sv']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['en']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ma']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ms']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['bi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['fy']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ke']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['tk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ge']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['re']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hkk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['idh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['mu']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sl']== 1)$term_subject .= '1'; else $term_subject .= '0';;





php loops variables variable-variables







share|improve this question













I'm building a concepts-database for my students. I have made a decision to store the school subjects in one column in the database where a 1 represents that the concept belongs to that subject. A concept can belong to several subjects, hence the strange storing system. I gather the altered subjects from the code shown in the code below. It bothers me that i can't make a loop where the variables change for each row. I have tried. I can get the subjects in an array from my database, but I can't manage to make the variable variables work.



TL;DR: How can I code the subjects in to a loop from my stored subjects, stored in the variable $subjects_short. I tried with



if ($'_POST[' . $subjects_short . ']'== 1)$term_subject .= '1'; else $term_subject .= '0';;


in the loop and I can't get it to work.



if ($_POST['sv']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['en']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ma']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ms']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['bi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['fy']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ke']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['tk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['ge']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hi']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['re']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['hkk']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['idh']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['mu']== 1)$term_subject .= '1'; else $term_subject .= '0';;
if ($_POST['sl']== 1)$term_subject .= '1'; else $term_subject .= '0';;





php loops variables variable-variables




php loops variables variable-variables






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 10 at 23:12









Björn Andersson

73




73







  • 2




    Its not a variable variable. Just an variable index. Go with $_POST[$subject_short]
    – DarkBee
    Nov 10 at 23:14










  • I'm not sure how to say this more constructively... if you're going to claim to be a teacher, you really owe it to your students to understand the subject matter a lot better than this. If I saw data design and implementation like that in a code review, the next thing I'd be reviewing would be resumes for potential replacement hires.
    – kungphu
    Nov 10 at 23:37










  • Thanks! Worked like a charm now and my code gets much prettier
    – Björn Andersson
    Nov 10 at 23:59










  • I'm not teaching programming. I teach social sciences. This is my hobby and I could never dream of teaching programming.
    – Björn Andersson
    Nov 11 at 0:02











  • You should use three tables: See How to store an array into mysql?
    – symlink
    Nov 11 at 0:14












  • 2




    Its not a variable variable. Just an variable index. Go with $_POST[$subject_short]
    – DarkBee
    Nov 10 at 23:14










  • I'm not sure how to say this more constructively... if you're going to claim to be a teacher, you really owe it to your students to understand the subject matter a lot better than this. If I saw data design and implementation like that in a code review, the next thing I'd be reviewing would be resumes for potential replacement hires.
    – kungphu
    Nov 10 at 23:37










  • Thanks! Worked like a charm now and my code gets much prettier
    – Björn Andersson
    Nov 10 at 23:59










  • I'm not teaching programming. I teach social sciences. This is my hobby and I could never dream of teaching programming.
    – Björn Andersson
    Nov 11 at 0:02











  • You should use three tables: See How to store an array into mysql?
    – symlink
    Nov 11 at 0:14







2




2




Its not a variable variable. Just an variable index. Go with $_POST[$subject_short]
– DarkBee
Nov 10 at 23:14




Its not a variable variable. Just an variable index. Go with $_POST[$subject_short]
– DarkBee
Nov 10 at 23:14












I'm not sure how to say this more constructively... if you're going to claim to be a teacher, you really owe it to your students to understand the subject matter a lot better than this. If I saw data design and implementation like that in a code review, the next thing I'd be reviewing would be resumes for potential replacement hires.
– kungphu
Nov 10 at 23:37




I'm not sure how to say this more constructively... if you're going to claim to be a teacher, you really owe it to your students to understand the subject matter a lot better than this. If I saw data design and implementation like that in a code review, the next thing I'd be reviewing would be resumes for potential replacement hires.
– kungphu
Nov 10 at 23:37












Thanks! Worked like a charm now and my code gets much prettier
– Björn Andersson
Nov 10 at 23:59




Thanks! Worked like a charm now and my code gets much prettier
– Björn Andersson
Nov 10 at 23:59












I'm not teaching programming. I teach social sciences. This is my hobby and I could never dream of teaching programming.
– Björn Andersson
Nov 11 at 0:02





I'm not teaching programming. I teach social sciences. This is my hobby and I could never dream of teaching programming.
– Björn Andersson
Nov 11 at 0:02













You should use three tables: See How to store an array into mysql?
– symlink
Nov 11 at 0:14




You should use three tables: See How to store an array into mysql?
– symlink
Nov 11 at 0:14

















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