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What potential issues can arise from not using proper indentation and syntax highlighting in PHP code?

Improper indentation and lack of syntax highlighting in PHP code can make the code difficult to read and understand, leading to errors and bugs. It can also make it challenging for other developers to collaborate on the code. Using proper indentation and syntax highlighting can improve code readability and maintainability.

php 
<?php

// Properly indented and syntax highlighted PHP code
function calculateSum($a, $b) {
    return $a + $b;
}

$number1 = 10;
$number2 = 20;

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

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

?>

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