Methods for variables outside of PHP calling functions

According to the general program of thinking, the variables outside the function should be considered as global variables, if it is a global variable, then call in the function is completely no problem. This article is mainly to share with you the PHP call function outside the variable method, I hope to help everyone.

It seems that PHP and our traditional thinking a bit of a problem, then the global variables in PHP, I deliberately write code to try.

1. Define the direct output externally with global:

Global $mytext; $mytext = "Nihao"; function Chao_echo () {echo $mytext;} Chao_echo ();

Result: no output.

2. Output with Globals array:

Global $mytext; $mytext = "Nihao"; function Chao_echo () {echo $GLOBALS [' mytext '];} Chao_echo ();

Result: the output is normal.

3. Declare variables outside the function globally within the function:

$mytext = "Nihao", function Chao_echo () {global $mytext; echo $mytext; Echo $GLOBALS [' mytext '];}

Chao_echo ();
Result: direct output or with Globals global array output is OK.

4. Pass the function external variables in parameters:

$mytext = "Nihao"; function Chao_echo ($mytext) {echo $mytext;} Chao_echo ($mytext);

Result: can be output.

To summarize, in PHP, there are three ways to refer to variables outside the function in a function:

1. Outside the function global declaration, the function uses the $globals array reference.

2. function within the global declaration, function within the $globals array or direct reference.

3. A parameter is passed when the function is called.