How can conditional statements, such as if, be implemented within a callback function in PHP when using preg_replace_callback?

When using preg_replace_callback in PHP, you can implement conditional statements within the callback function by checking the matched values and applying different replacements based on certain conditions. You can use if statements within the callback function to determine which replacement to use depending on the matched value. This allows you to have more control over the replacements done by preg_replace_callback. 

// Example of implementing conditional statements within a preg_replace_callback function
$string = "Hello World";
$pattern = '/\b(\w+)\b/';
$newString = preg_replace_callback($pattern, function($matches) {
    // Check if the matched word is "Hello" and replace it with "Hi"
    if($matches[0] == "Hello") {
        return "Hi";
    } else {
        return $matches[0];
    }
}, $string);

echo $newString; // Output: "Hi World"

Keywords

conditional statements if callback function preg_replace_callback PHP

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