A deep understanding of phpprintf () output formatted strings

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Definition and usage

The printf () function outputs formatted strings.

The arg1, arg2, and arg ++ parameters are inserted to the percent sign (%) in the main string. This function is executed step by step. Insert arg1 at the first % symbol, insert arg2 at the second % symbol, and so on.

Note: If the % symbol is greater than the arg parameter, you must use a placeholder. After the placeholder is inserted into the % symbol, it consists of numbers and "\ $. See Example 2.

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

• Fprintf ()
• Sprintf ()
• Vfprintf ()
• Vprintf ()
• Vsprintf ()

Syntax

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

Instance

Example 1

Use format value % f:

Example 2

Use placeholders:

 No decimals: % 1 \ $ u ", $ number);?>

Example 3

Demonstration of all possible format values:

 ", $ Num1); // binary number printf (" % c = % c
", $ Char); // ASCII character printf (" % d = % d
", $ Num1); // signed decimal number printf (" % d = % d
", $ Num2); // signed decimal number printf (" % e = % e
", $ Num1); // Scientific notation (lower case) printf (" % E = % E
", $ Num1); // Scientific notation (uppercase) printf (" % u = % u
", $ Num1); // unsigned decimal number (positive) printf (" % u = % u
", $ Num2); // unsigned decimal number (negative) printf (" % f = % f
", $ Num1); // floating point number (depending on local settings) printf (" % F = % F
", $ Num1); // floating point number (not depending on local settings) printf (" % g = % g
", $ Num1); // shorter than % e and % fprintf (" % G = % G
", $ Num1); // less than % E and % fprintf (" % o = % o
", $ Num1); // eight digits printf (" % s = % s
", $ Num1); // string printf (" % x = % x
", $ Num1); // hexadecimal number (lower case) printf (" % X = % X
", $ Num1); // hexadecimal number (uppercase) printf (" % + d = % + d
", $ Num1); // symbol specifier (positive) printf (" % + d = % + d
", $ Num2); // symbol specifier (negative)?>

Example 4

Demonstration of string specifiers:

 ",$str1);printf("[%8s]
",$str1);printf("[%-8s]
",$str1);printf("[%08s]
",$str1);printf("[%'*8s]
",$str1);printf("[%8.8s]
",$str2);?>

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