PHP Pass-through references and global variables

<?php/* Function internally change the value of the variable two methods */$a = 10;/* * Method One: Function parameters are referenced  */function methodone (& $a) {echo $a--;//output, $a = 9;} /* Method Two: global variable */function methodtwo () {global $a; Echo $a--;//output 9, $a =8}methodone ($a), echo "<br/>", echo $a; echo "< Br/> "; Methodtwo (); echo" <br/> "; echo $a;? >

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PHP Pass-through references and global variables