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What are php global variables?

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What are php global variables?
posted May 31, 2018 by anonymous

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2 Answers

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Global scope refers to any variable that is defined outside of any function. PHP also stores all global variables in an array called $GLOBALS[index]. Its index is the name of the variable. This array is also accessible from within functions and can be used to update global variables directly.

answer Jun 25, 2018 by Manish Tiwari
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Hey, In php SUPERGLOBAL is class for variable like global and others,

$GLOBALS is a PHP super global variable which is used to access global variables from anywhere in the PHP script (also from within functions or methods). PHP stores all global variables in an array called $GLOBALS[index].
Here is the exammple of it:+

<?php
$s = 25;
$t = 50;
function subtraction()
{
$GLOBALS['v'] = $GLOBALS['t'] - $GLOBALS['s'];
} 
subtraction();
echo $v;
?> 
answer Aug 1 by Siddhi Patel
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+1 vote

Why I can't read static variables of a child class, even so the variable is protected or public?

Here's what I tried:

class A {
 protected static $foo = "bar";
}

class B {
 public function readFoo() {
 return self::$foo;
 }
}

When now calling B::readFoo, I get the following error:

var_dump((new B())->readFoo());

PHP Fatal error: Access to undeclared static property: B::$foo in php shell code on line 1
PHP Stack trace:
PHP 1. {main}() php shell code:0
PHP 2. B->readFoo() php shell code:1

Fatal error: Access to undeclared static property: B::$foo in php shell
code on line 1

Call Stack:
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 86.2666 231352 2. B->readFoo() php shell code:1
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