How to declare a global variable in php

Question

I have code something like this    lt        a  localhost       function body            global  a          echo  a             function head            global  a          echo  a             function footer            global  a          echo  a          gt    is there any way to define the global variable in one place and make the variable  a accessible in all the functions at once  without making use of global  a  more

User · Answer

You answered this in the way you wrote the question - use 'define'. but once set, you can't change a define.

Alternatively, there are tricks with a constant in a class, such as class::constant that you can use. You can also make them variable by declaring static properties to the class, with functions to set the static property if you want to change it.

User · Answer

Let s think a little different  You can use static parameters  class global       static  foo    quot bar quot      And you can use and modify it every where you like  like  function func         echo global   foo

User · Answer

Add your variables in  GLOBALS super global array like    GLOBALS  variable      localhost      and use it globally  or you can use constant which are accessible throughout the script  define  HOSTNAME    localhost

User · Answer

This answer is very late but what I do is set a class that holds Booleans  arrays  and integer-initial values as global scope static variables  Any constant strings are defined as such   define  myconstant    value      class globalVars        static  a   false       static  b   0       static  c   array  first    gt  2   second    gt  5        function test  num         if   globalVars   a              returnVal    The     myconstant     of      num     plus     globalVars   b     plus     globalVars   c  second       is       num   globalVars   b   globalVars   c  second                    globalVars   a   true         else             returnVal    I forgot               return  returnVal      echo test 9   --- gt  The value of 9   0   5 is 14   echo   lt br gt     echo globalVars   a  ---- gt  1   The static keywords must be present in the class else the vars  a   b  and  c will not be globally scoped

User · Answer

GLOBALS   is the right solution  but since we re talking about alternatives  a function can also do this job easily   function capital         return my var       is the capital of Italy      function my var         return  Rome

User · Answer

You can try the keyword use in Closure functions or Lambdas if this fits your intention    PHP 7 0 though  Not that s its better  but just an alternative    foo    New    closure    function  bar  use   foo        echo   foo  bar       York      demo    info

User · Answer

The  GLOBALS array can be used instead    GLOBALS  a      localhost    function body         echo  GLOBALS  a        From the Manual      An associative array containing references to all variables which are currently defined in the global scope of the script  The variable names are the keys of the array      If you have a set of functions that need some common variables  a class with properties may be a good choice instead of a global   class MyTest       protected  a       public function   construct  a                 this- gt a    a             public function head                 echo  this- gt a             public function footer                 echo  this- gt a            a    localhost    obj   new MyTest  a

User · Answer

If the variable is not going to change you could use define  Example   define  FOOTER CONTENT    Hello I  m an awesome footer      function footer         echo FOOTER CONTENT

User · Answer

If a variable is declared outside of a function its already in global scope  So there is no need to declare  But from where you calling this variable must have access to this variable  If you are calling from inside a function you have to use global keyword    variable   5   function name         global  variable        value    variable   5       return  value         Using global keyword outside a function is not an error  If you want to include this file inside a function you can declare the variable as global   config php  global  variable    variable   5      other php  function name         require once   DIR       config php       You can use  GLOBALS as well  It s a superglobal so it has access everywhere    GLOBALS  variable     5   function name         echo  GLOBALS  variable        Depending on your choice you can choose either

User · Answer

What if you make use of procedural function instead of variable and call them any where as you   I usually make a collection of configuration values and put them inside a function with return statement  I just include that where I need to make use of global value and call particular function   function host        return  localhost

[php] How to declare a global variable in php?

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