PHP Basic Tutorial

PHP Advanced Tutorial

PHP & MySQL

PHP Reference Manual

PHP CURL Functions PHP OpenSSL Functions

PHP printf() Function Usage and Examples

　　 PHP String Manual of String Functions

　　 The printf() function is used to output formatted strings.

Syntax

int printf ( string $format[, mixed $args[, mixed $... ]])

Definition and usage

Returns the formatted output string

Return value

It returns the length of the output string.

Parameter

Serial number	Parameters and descriptions
1	format Specify the string and how to format the variables within it. Possible format values: %% - return a percent sign % %b - binary number %c - character corresponding to ASCII value %d - decimal number with a sign (negative, 0, positive) %e - Use lowercase scientific notation (for example 1.2e+2 %E - Use uppercase scientific notation (for example 1.2E+2 㩵n - decimal number without a sign (greater than or equal to 0) %f - floating-point number (local setting) %F - floating-point number (non-local setting) %g - short %e and %f %G - short %E and %f %o - octal number %s - string %x - hexadecimal number (lowercase letters) %X - hexadecimal number (uppercase letters) additional format values. Must be placed between % and the letter (for example %.2f): + (add a prefix to the number before + or - to define the sign of the number. By default, only negative numbers are marked, and positive numbers are not marked) Specify what to use as padding, the default is space. It must be used with the width specifier. For example: '%x20s (Use "x" as padding) - (Left align the variable value) ][0-9] (Specify the minimum width of the variable value) ][0-9] (Specify the number of decimal places or maximum string length) Note:If multiple of the above format values are used, they must be used in the order specified above and cannot be disrupted.
2	arg1 Required. Specify the parameter to be inserted into the first % symbol in the format string.
3	arg2 Optional. Specify the parameter to be inserted into the second % symbol in the format string.
4	arg ... Optional. Specify the parameter to be inserted into the format string at the third, fourth, and so on % symbols.

Online example

Try the following example, output formatted data and string:

Example

<?php
　　　　////Output formatted string
　　　　printf("www.oldtoolbag.com　simply　easy　learning\n");
　　　　//Use the format value　%f to format the number:
　　　　$number =　2123;
　　　　printf("%f", $number);
　　　　$str = "0758　jian";
　　　　$strA = "A";
　　　　$strB = "B";
　　　　$num1　=　5;
　　　　$num2　=　5;
　　　　$num3　= 0.25;
　　　　$num4　=　3.2567;
　　　　$num5　=　8;
　　　　$num6　=　1.735;
　　　　$num7　=　16777215;
　　　　$num8　=　16777215;
　　　　echo '<br　/>';
　　　　printf("%s　%s", $strA, $strB);　
　　　　echo '<br　/>';
　　　　printf("Padding:　%'%"10s　//Specify the padding character as %string width as10
　　　　echo '<br　/>';
　　　　printf("Binary:　%b", $num)1);
　　　　echo '<br　/>';
　　　　printf("ASCII code:　%c", $num)2);
　　　　echo '<br　/>';
　　　　printf("Integer:　%d", $num)3);
　　　　echo '<br　/>';
　　　　2f4);
　　　　echo '<br　/>';
　　　　printf("Octal:　%o", $num)5);
　　　　echo '<br　/>';
　　　　printf("String:　%s", $str);
　　　　echo '<br　/>';
　　　　printf("Non-decimal:　眻, $num)6);
　　　　echo '<br　/>';
　　　　printf("Hexadecimal:　%x", $num)7);
　　　　echo '<br　/>';
　　　　printf("Hexadecimal:　%X", $num)8);　　　
?>

Test and see‹/›

Output result

www.oldtoolbag.com　simply　easy　learning
2123.000000A2　B1
Padding:　%0758　jian
Binary:　101
ASCII code:　
Integer:　0
Floating-point:　3.26
Octal:　10
String:　0758　jian
Non-decimal:　1
Hexadecimal:　ffffff
Hexadecimal:　FFFFFF

PHP String Manual of String Functions

PHP CURL Functions PHP OpenSSL Functions