How can we troubleshoot issues related to variable passing in PHP?

When troubleshooting variable passing issues in PHP, ensure that variables are properly declared and passed between functions or scripts. Check for typos, scope issues, and variable naming conflicts. Additionally, use debugging tools like var_dump() or print_r() to inspect variable values at different stages of execution. 

// Example code demonstrating proper variable passing in PHP

function calculateSum($num1, $num2) {
    return $num1 + $num2;
}

$number1 = 10;
$number2 = 20;

$result = calculateSum($number1, $number2);

echo "The sum of $number1 and $number2 is: $result";

Keywords

variable passing PHP debugging pass by reference pass by value

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