Local variables and global variables in php_PHP tutorial

How to understand scope in PHP? Let’s introduce local variables: variables declared inside functions. Global variables: Variables declared outside the function should be explained in detail

7.2.8 Convert local variables into global variables

{

The code is as follows

代码如下	复制代码
$a = 5; function funcChangeValue() {     global $a;     $a = 10; }   funcChangeValue();   echo $a; ?>   output 10

Copy code

$a = 5;

代码如下	复制代码
$GLOBALS['a'] = 5; function funcChangeValue() {     $GLOBALS['a'] = 10; }   funcChangeValue();   echo $GLOBALS['a']; ?>   Output 10

function funcChangeValue()

global $a;

$a = 10; } funcChangeValue(); echo $a; ?>

output

10

7.2.9 Use of super global variable $GLOBALR

The code is as follows

Copy code

$GLOBALS['a'] = 5; function funcChangeValue() { $GLOBALS['a'] = 10; } funcChangeValue(); echo $GLOBALS['a']; ?> Output 10 http://www.bkjia.com/PHPjc/629235.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629235.htmlTechArticleHow to understand scope in PHP? Let’s introduce local variables: declared inside a function variable. Global variables: variables declared outside the function, detailed description...