What is the usage of php printf

php The function of the printf function is to output a formatted string. The syntax for using printf is "printf(format,arg1,arg2,arg)", where the parameter format specifies the string and how to format the variables in it. .

The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer

What is the usage of php printf?

The printf() function outputs a formatted string.

arg1, arg2, arg 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, arg2, and so on.

Note: If there are more % symbols than arg arguments, you must use placeholders. The placeholder is inserted after the % symbol and consists of a number and "\$". See example 2.

printf() Syntax:

printf(format,arg1,arg2,arg++)

Parameters

Parameter format is required. Specifies a string and how to format variables within it.

Possible format values:

%% - returns a percent sign %

%b - a binary number

%c - the corresponding ASCII value Characters

%d - Decimal number with sign (negative, 0, positive)

%e - Scientific notation using lowercase (e.g. 1.2e 2)

%E - Use uppercase scientific notation (e.g. 1.2E 2)

%u - Decimal number without sign (greater than or equal to 0)

%f - Floating point number (local setting)

%F - floating point number (non-local setting)

%g - shorter %e and %f

%G - shorter %E and %f

%o - octal number

%s - string

%x - hexadecimal number (lowercase letters)

%X - Hexadecimal number (capital letters)

Additional format value. Must be placed between % and a letter (such as %.2f):

(Add or - in front of the number to define the sign of the number. By default, only negative numbers are marked, and positive numbers are not marked. )

' (Specifies what to use as padding, defaults to spaces. It must be used with a width specifier.)

- (Left-adjusted variable value)

[0 -9] (Specifies the minimum width of the variable value)

.[0-9] (Specifies the number of decimal places or the maximum string length)

Note: If multiple above format values ​​are used , they must be used in the order above and cannot be disrupted.

arg1 Required. Specifies the parameters to be inserted at the first % sign in the format string.

arg2 Required. Specifies the parameter to be inserted into the format string at the second % sign.

arg Optional. Specifies the parameters to be inserted into the format string at the third, fourth, etc. % symbols.

Example

Use format value %f:

<?php
$number = 123;
printf("%f",$number);
?>

Output:

123.000000

Related functions: sprintf(), vprintf(), vsprintf (), fprintf() and vfprintf()

Recommended: "PHP Video Tutorial"

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