Application of sprintf() function in PHP

The example replaces the percent sign (%) symbol with a variable passed as a parameter:

<?php
$number = 2;
$str = "Shanghai";
$txt = sprintf("There are %u million cars in %s.",$number,$str);
echo $txt;
?>

sprintf() function writes the formatted string into the variable. The arg1, arg2, ++ parameters will be inserted into the main string at the percent sign (%) symbol. This function is executed step by step. At the first % sign, insert arg1, at the second % sign, insert arg2, and so on.

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