How Can We Efficiently Replace Placeholders in Strings?

Replacing Placeholders in Strings

This question focuses on a function designed to replace placeholder variables within a string. The function searches for placeholders enclosed in curly brackets, extracts the key within brackets, and replaces it with a corresponding value from a provided array.

Here's an alternative approach to optimizing the code:

The original function employs a complicated RegEx to extract the placeholder variables. Instead, we can use a simpler loop to iterate through the string and locate the placeholders directly.

The revised function:

function dynStr($str, $vars) {
    foreach ($vars as $key => $value) {
        $key = strtoupper($key);
        $str = str_replace("{" . $key . "}", $value, $str);
    }
    return $str;
}

In the revised function:

• We remove the need for RegEx by iterating through the array of variables.
• We directly replace the placeholders without needing intermediate conversions.
• We simplify the code, making it more readable and maintainable.

This approach offers a simplified and optimized solution for replacing placeholder variables in strings.

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