What are the potential risks of using global variables in PHP, especially in the context of multithreading?

Using global variables in PHP can lead to issues such as variable conflicts, unintended variable modifications, and difficulties in debugging and maintaining code. In the context of multithreading, global variables can be accessed and modified concurrently by multiple threads, leading to race conditions and unpredictable behavior. To avoid these risks, it's recommended to use local variables or pass variables as parameters to functions instead of relying on global variables. 

<?php
function myFunction($param1, $param2) {
    // Use $param1 and $param2 instead of global variables
    // Your code here
}

$var1 = 'value1';
$var2 = 'value2';

myFunction($var1, $var2);
?>

Keywords

global variables PHP multithreading concurrency race conditions

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