Php function variable scope and function return value tutorial

See the instance below

The code is as follows:	Copy code
<? Php $ A = 1; $ B = 2; Function Sum () { Global $ a, $ B; $ B = $ a + $ B; } Sum (); Echo $ B; ?>

In this way, the value of $ B is 3, and global is a global variable in php. So let's look at the php variable reference instance.

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<? Php Function str_unite (& $ string) { $ String. = 'also like blue .'; } $ Str = 'like red ,'; Str_unite ($ str ); Echo $ str; // output result: 'Like red or blue .' ?>

The above is about the function scope.Global variables and functionsSee the local variables of a function.

The code is as follows:	Copy code
<? Php $ A = 1; $ B = 2; Function Sum ($ a, $ B) { $ B = $ a + $ B; Echo $ B; // 3 } Sum ();// Echo $ B; // 2 ?>

The original tutorial on this site is reproduced with the source www.111cn.net/phper/php.html