How can the scope of variables impact the functionality of eval() in PHP scripts?

The scope of variables can impact the functionality of eval() in PHP scripts because eval() evaluates a string as PHP code in the current scope. If the variables used in the evaluated code are not in the same scope as the eval() function, it may lead to unexpected behavior or errors. To avoid this, you can pass the necessary variables as parameters to the eval() function. 

$var1 = 5;
$var2 = 10;

$code = '$result = $var1 + $var2;';
eval($code);

echo $result; // Output: 15

Keywords

scope variables eval() PHP scripts functionality

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