PHP学习：全局变量和局部变量的互相引用

2016－08－24

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局部函数调用全部变量的三种方法

<?php//局部函数调用全局变量//method one :   using   superglobal(超全局变量)$_POST['a']=100;function call1(){    echo $_POST['a'].'<br>';}call1();// method two :  using   $GLOBALS  to define the variable$a=99;function call2(){   echo  $GLOBALS['a'].'<br>';}call2();//method three : using global to define the variable$a=98;function call3(){     global $a;     echo $a;}call3();?>

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函数外调用局部变量的三种方法

<?php//函数外部调用局部变量//method one :using superglobalfunction call1(){    $_GET['$A']=100;}call1();echo $_GET['$A'];//method two :using $GLOBALS to define variablefunction call2(){    $GLOBALS['A']=99;} call2();echo $A;//method three : using global to define variablefunction call3(){     global $a ;     $a=98;}call3();echo $a;?>