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| en:create:variables [05.02.2015 21:03] – [PHP Variables] alexander.ritter | en:create:variables [05.02.2015 21:06] – [Use Variables Continuously] alexander.ritter |
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| ==== Working with Variables ==== | ==== Working with Variables ==== |
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| Variables allow you to calculate superbly. In the following example, the participant is asked question "AB01" on page 1 -- a text input for a number. The response is read on page 2 using ''value()'' and stored in the variable ''$number''. This variable it multiplied by 2 (''*'') and the result is stored in the variable ''$result''. | Variables allow you to calculate superbly. In the following example, the participant is asked question "AB01" on page 1 -- a text input for a number. The response is read on page 2 using ''value()'' and stored in the variable ''$number''. This variable is multiplied by 2 (''*'') and the result is stored in the variable ''$result''. |
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| Subsequently, the variable ''$result'' is treated as text (string) and linked with two other string (''.''). The result of this link is transferred to the function ''html()'' to display in the questionnaire. | Subsequently, the variable ''$result'' is treated as text (string) and linked with two other string (''.''). The result of this link is transferred to the function ''html()'' to display in the questionnaire. |
| It makes sense that the stations are queried in the same order in both questions. In order to do so, first of a list ([[:en:create:array|Array]]) of the item IDs in a random order is created using ''[[:en:create:functions:random_items|random_items()]]''. This list is stored in the variable ''$items''. | It makes sense that the stations are queried in the same order in both questions. In order to do so, first of a list ([[:en:create:array|Array]]) of the item IDs in a random order is created using ''[[:en:create:functions:random_items|random_items()]]''. This list is stored in the variable ''$items''. |
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| The variable ''$items'' is not only needed on the current page, but on the following page for question "AB02" as well. Theefore, this is made available for future PHP code elements using ''[[:en:create:functions:registervariable|registerVariable()]]''. Subsequently, question "AB01" will be displayed with the shuffled order. | The variable ''$items'' is not only needed on the current page, but on the following page for question "AB02" as well. This is therefore made accessible for future PHP code elements using ''[[:en:create:functions:registervariable|registerVariable()]]''. Subsequently, question "AB01" will be displayed in the shuffled order. |
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| <code php> | <code php> |
