In PHP, when should you use %s and %n in sprintf, and what are the differences between the two placeholders?

When using sprintf in PHP, you should use %s for string placeholders and %d for integer placeholders. %s is used for string values, while %d is used for numeric values. Using the correct placeholder ensures that the values are formatted correctly in the resulting string. 

$name = "John";
$age = 30;

// Using %s for string and %d for integer placeholders
$string = sprintf("My name is %s and I am %d years old.", $name, $age);

echo $string;

Keywords

PHP sprintf %s %n placeholders

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