Why Use Sprintf Function in PHP

Why use sprintf function in PHP?

sprintf has all the formatting capabilities of the original printf which means you can do much more than just inserting variable values in strings.

For instance, specify number format (hex, decimal, octal), number of decimals, padding and more. Google for printf and you'll find plenty of examples. The wikipedia article on printf should get you started.

Printf and sprintf where exactly used in php? give one example?

Using sprintf have many options to format your output string. This SO answer will help you more:

Why use sprintf function in PHP?

Performance of variable expansion vs. sprintf in PHP

In all cases the second won't be faster, since you are supplying a double-quoted string, which have to be parsed for variables as well. If you are going for micro-optimization, the proper way is:

$message = sprintf('The request %s has %d errors', $request, $n);

Still, I believe the seconds is slower (as @Pekka pointed the difference actually do not matter), because of the overhead of a function call, parsing string, converting values, etc. But please, note, the 2 lines of code are not equivalent, since in the second case $n is converted to integer. if $n is "no error" then the first line will output:

The request $request has no error errors

While the second one will output:

The request $request has 0 errors

sprintf php - How does it work?

Sprintf basix

Sprintf adds the parameters to the first parameter at the place of the placeholders (which begins with %).

For instance:

$name = 'Rob';
$str = sprintf('Hello, I am %s', $name); // become: Hello, I am Rob

The letter after % is the first letter of the type of the parameter. A string is %s, an decimal is %d. For instance:

$name = 'Rob';
$age = 26;
$str = sprintf('Hello, I am %s and I am %d years old.', $name, $age);
// become: Hello, I am Rob and I am 26 years old.

Sprintf use the order of the parameters to determine where to place it in the string. The first placeholder gets the second parameter, the second placeholder the thirth, ect.

If you want to change this, you need to specify this between % and the type. You do this by <place>$ where <place> is the place nummer.

$name = 'Rob';
$age = 26;
$str = sprintf('Hello, I am %2$s and I am %1$d years old.', $age, $name);
// become: Hello, I am Rob and I am 26 years old.

The answer

You do this:

'<h1><a href="%1$s">%s</a></h1><p>%s</p>'

The %1$s is the first parameter, which is the template_uri. I think this isn't the url which you want to link to? You want to link to the uri in $link. Just place that in the parameters and refer to it:

sprintf(
    '...'.
    '<h1><a href="%s">%s</a></h1><p>%s</p>',
    Website::get('template_uri'), $icon, $link, $title, $text
);

Explanation of this format string used in PHP sprintf

• % is the start of the conversion specification

• 01\$ signifies that the value will be placed in the first item of the result

  ^{More usually, the same would be written as 1$}

• .2 is the precision specifier, which dictates how many decimal digits should be displayed

• f means that the argument is treated as a float, and presented as a floating-point number (locale aware)

For full details of the above, and what is available, see the description of the format parameter of sprintf().

Why is sprintf giving asterisks instead of my formatted string?

This issue was actually caused because the sequence of numbers matched the Luhn Algorithm, and was being masked in my PCI environment. I manually excluded the file from the test, and everything now is working as expected.

PHP, Printf,Sprintf Functions

The sign specifier forces a sign, even if it's positive. So, if you have

$x = 10;
$y = -10;
printf("%+d", $x);
printf("%+d", $y);

You'll get:

+10
-10

The padding specifier adds left padding so that the output always takes a set number of spaces, which allows you to align a stack of numbers, useful when generating reports with totals, etc.

 $x = 1;
 $y = 10;
 $z = 100;
 printf("%3d\n", $x);
 printf("%3d\n", $y);
 printf("%3d\n", $z);

You'll get:

   1
  10
 100

If you prefix the padding specifier with a zero, the strings will be zero padded instead of space padded:

 $x = 1;
 $y = 10;
 $z = 100;
 printf("%03d\n", $x);
 printf("%03d\n", $y);
 printf("%03d\n", $z);

Gives:

 001
 010
 100

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