In PHP, what do %s and %d mean?

In PHP, you often encounter %s and %d. This article will introduce what %s and %d mean?

Parameters used by PHP sprintf() function

printf - Output formatted string

sprintf() function writes the formatted string into a variable.

%% - Returns the percent symbol

%b - Binary number

%c - Character according to ASCII value

%d - Signed decimal number

%e - Continuous notation (e.g. 1.5e 3)

%u - Unsigned decimal number

%f - Floating point number (local settings aware)

%F - floating point number (not local settings aware)

%o - octal number

%s - string

%x - hexadecimal Number (lowercase letters)

%X - Hexadecimal number (uppercase letters)

<?php
$str = "Hello";
$number = 123;
$txt = sprintf("%s world.  number %d",$str,$number);
echo $txt;
?>

Output:

Hello world. number 123

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