tag in the end */ function echo_br($text){ echo "$text
"; } // Global Scope $globalVar1 = "hi"; function testingScope1($localVar){ // Local scope $globalVar1 = $localVar; echo_br($globalVar1); } testingScope1($globalVar1); // hi echo_br($globalVar1); // hi testingScope1("hello"); // hello echo_br($globalVar1); // hi echo_br("##############################"); /** * If we wish to use the global version * of same variable then we have to * declare that inside the function. * using "global" keyword. */ $globalVar2 = "bye"; function testingScope2($localVar){ // This declaration means now // we are using global $globalVar2 // inside the function global $globalVar2; $globalVar2 = $localVar; echo_br($globalVar2); } testingScope2($globalVar2); // bye echo_br($globalVar2); // bye testingScope2("See Ya!"); // See Ya! echo_br($globalVar2); // See Ya! echo_br("##############################"); /** * Now lets try to pass the arguments * by reference to the functions using * "&" keyword. * * Somewhat similar functionality as of * global keyword, So that we can access * the actual variable */ $globalVar3 = "why"; function testingScope3(&$globalVar3){ // Notice the & above to access $globalVar3 $globalVar3 = "So Shy!"; echo_br($globalVar3); } echo_br($globalVar3); // why testingScope3($globalVar3); // So Shy! echo_br($globalVar3); // So Shy! ?>

Understanding Scope in PHP, Local & Global