PHP Variable Scope | Local Vs Global Scope in PHP - PHP Tutorial 61

ChidresTechTutorials منتشر شده در تاریخ 1398/08/16

2.2 هزار بار بازدید - 5 سال پیش - PHP Variable Scope.- Scope indicates

PHP Variable Scope.
- Scope indicates the accessibility and visibility of variables.
- variables in PHP will be either in local scope or global scope.

Local scope:
- Any variable declared inside a function is considered as in local scope or function scope
- can be accessible only inside that function where it is declared
Note: Local scope variables will be available only in the function execution (i.e. are created as soon as the control enters the function body and deleted as soon as the control exits the function body)

Example:
function display()
{
$b=20;
echo "b= ", $b," "; // 20
}
display();
echo "b= ", $b," "; // error: b is not defined

Global scope:
- Any variable declared outside a function is considered as in global scope
- can be accessible anywhere in the script
Note: Global scope variables will be available throughout the script execution
- if you want to access a global scope variable inside a local scope you must use global keyword

Example 1:
$a=10;
echo "a= ", $a, " "; // 10
function display()
{
//echo "a= ", $a," "; // undefined error
global $a;
echo "a= ", $a," "; // 10
}
display();

Example 2:
$a=10;
echo "a= ", $a, " "; // 10

$b = 20;
function display()
{
//echo "a= ", $a," "; // undefined error
global $a;
echo "a= ", $a," "; // 10

$b =30;
echo "b=", $b," "; // 30
}
display();

echo "b=", $b," "; // 20

Note:
- replace < with less-than symbol.
- replace > with greater-than symbol.

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5 سال پیش در تاریخ 1398/08/16 منتشر شده است.

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