How can dynamic variables be accessed globally in PHP scripts?

Dynamic variables can be accessed globally in PHP scripts by using the global keyword within functions to access variables defined outside of the function's scope. This allows you to modify global variables from within a function. However, it is generally considered better practice to pass variables as parameters to functions rather than relying on global variables. 

$globalVar = "Hello";

function modifyGlobalVar() {
    global $globalVar;
    $globalVar .= " World!";
}

modifyGlobalVar();
echo $globalVar; // Output: Hello World!

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