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Local variables and global variables in php_PHP tutorial

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Jul 13, 2016 pm 05:13 PM

php one time under introduce Scope overall situation about variable Woolen cloth and exist local us understand

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

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

function funcChangeValue() { global $a;

output

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...

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