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Function Variable Scope in PHP
Variables created outside of your function will only be availabe for use outside the function. If you need a variable to be available for use inside and outside of your functions we claim it to be a global variable. If you create a variable inside of your functions it is only available inside that function. To make the variables created more versatile and reusable you can set them as global. The three examples below will show variable scope in different scenarios.

Example of using global to set a variable's scope to be wider and use inside and outside of functions:
Learn HTML
<?php
$var1 
"Hello ";
function 
sampleFunction() { 
    
// Set $var1 variable as global 
    
global $var1
    
// Now echo to the browser 
    
echo  "$var1 World <hr />"


// execute function to run
sampleFunction(); 
 
// Now echo to the browser again using variable created in our function
echo "$var1 World <hr />"
?>

Develop PHP browser display window
Hello World
Hello World


Example of NOT being able to access a variable outside of a function:
Learn HTML
<?php
function sampleFunction() { 

    
$var1 "Hello ";
    
// Now echo to the browser 
    
echo  "$var1 World <hr />"


// execute function to run
sampleFunction(); 
 
// Now echo to the browser again using variable created in our function
echo "$var1 World <hr />"
?>

Develop PHP browser display window
Hello World
World


Example of not being able to access a variable inside of a function:
Learn HTML
<?php
$var1 
"Hello ";
function 
sampleFunction() { 
    
// Now echo to the browser 
    
echo  "$var1 World <hr />"


// execute function to run
sampleFunction(); 
 
// Now echo to the browser again using variable created in our function
echo "$var1 World <hr />"
?>

Develop PHP browser display window
World
Hello World



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