Use references and global in php

: This article mainly introduces the use of reference and global in php. For more information about PHP tutorials, see. In php, parameters in a function are passed as values, for example:

The output is 12.

If you want to change to reference transfer, you only need to change the function body and use the reference symbol &:

Function f (& $ a) {$ a + = 10 ;}

Another way is to change $ a to a global variable in the function body and use the global keyword:

Function f ($ a) {global $ a; $ a + = 10 ;}

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The above introduces the use of reference and global in php, including the content, and hope to be helpful to friends who are interested in PHP tutorials.