Read Environment Variable

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# Read Environment Variable

Subroutine Name | Executable Example | Viewable Example
--- | --- | ---
W3READ-ENVIRONMENT-ARRAY W3READ-ENVIRONMENT W3READ-ENVIRONMENT-TO-DYNAMIC | E3ENVARY | E3ENVARY

> Description

>   Reads the first occurrence of a single variable. With `W3READ-ENVIRONMENT-ARRAY`, a variable can be read beginning with an offset. This can be used to read multiple occurrences of the same variable.

> Parameters

>   1. W3READ-ENVIRONMENT-ARRAY

>          1 W3START        (I4)       /* io/m : Offset to be started at
>          *                           /*        out: 0 no occurrences
>          *                           /*        out: >0 more occurrences
>          1 W3NAME         (A072)     /* i /m : Name of the variable to
>          *                           /*        be searched for
>          1 W3VALUESERVER  (A1)       /* i /m : Search for variables from
>          *                           /*        'S' server
>          *                           /*        'P' page or URL
>          *                           /*        ' ' both
>          1 W3ARRAYCOUNTER (I4)       /* io/m : Size of array,
>                                      /*        characters read
>          1 W3VALUEARRAY   (A001/1:V) /*  o/m : Array with the returned value
>          1 W3VALUELENGTH  (I4)       /*  o/m : length of the value

>   2. W3READ-ENVIRONMENT

>          1 W3NAME        (A072) /* i /m : Name of the variable
>                                 /*        searched for
>          1 W3VALUESERVER (A1)   /* i /m : Search for variables in
>          *                      /*        'S' server
>          *                      /*        'P' page or URL
>          *                      /*        ' ' both
>          1 W3VALUE       (A250) /*  o/m : Returned value
>          1 W3VALUELENGTH (I4)   /*  o/m : Length of the value

>   3. W3READ-ENVIRONMENT-TO-DYNAMIC

>          1 W3NAME         (A072)      /* i /m : Name of the variable
>                                       /*        searched for
>          1 W3VALUESERVER  (A1)        /* i /m : Search for variables in
>          *                            /*        'S' server
>          *                            /*        'P' page or URL
>          *                            /*        ' ' both
>          1 W3VALUEDYNAMIC (A) DYNAMIC /* o/m : Returned value

> How To Invoke

>       PERFORM W3READ-ENVIRONMENT-ARRAY W3START W3NAME
>               W3VALUESERVER W3ARRAYCOUNTER
>               W3VALUEARRAY(*) W3VALUELENGTH

>       PERFORM W3READ-ENVIRONMENT W3NAME W3VALUESERVER W3VALUE
>               W3VALUELENGTH

>       PERFORM W3READ-ENVIRONMENT-TO-DYNAMIC W3NAME W3VALUESERVER
>               W3VALUEDYNAMIC