What potential issues can arise from declaring global variables in PHP?

Declaring global variables in PHP can lead to potential issues such as variable scope conflicts and difficulty in tracking variable changes throughout the code. To solve this issue, it is recommended to use PHP's superglobal arrays like $_SESSION, $_POST, or $_GET to store and retrieve global variables. 

// Using superglobal arrays to store global variables
$_SESSION['global_variable'] = 'value';
echo $_SESSION['global_variable'];

Keywords

global variables PHP scope variable conflict namespace

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