How can PHP developers prevent variables from being overwritten unintentionally in their code?

To prevent variables from being overwritten unintentionally in PHP code, developers can use the `isset()` function to check if a variable is already defined before assigning a new value to it. This helps avoid accidental reassignment of variables and potential bugs in the code. 

if (!isset($myVar)) {
    $myVar = 'new value';
}

Keywords

PHP variable scope global keyword namespaces constants

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