PHP格式化输出

int printf ( string $format [, mixed $args [, mixed $... ]] ) string sprintf ( string $format [, mixed $args [, mixed $... ]] ) int vprintf ( string $format , array $args ) string vsprintf ( string $format , array $args )

printf和vprintf返回输出字符串的长度,sprintf和vsprintf返回字符串

• % - a literal percent character. No argument is required.
• b - the argument is treated as an integer, and presented as a binary number.
• c - the argument is treated as an integer, and presented as the character with that ASCII value.
• d - the argument is treated as an integer, and presented as a (signed) decimal number.
• e - the argument is treated as scientific notation (e.g. 1.2e+2). The precision specifier stands for the number of digits after the decimal point since PHP 5.2.1. In earlier versions, it was taken as number of significant digits (one less).
• E - like %e but uses uppercase letter (e.g. 1.2E+2).
• u - the argument is treated as an integer, and presented as an unsigned decimal number.
• f - the argument is treated as a float, and presented as a floating-point number (locale aware).
• F - the argument is treated as a float, and presented as a floating-point number (non-locale aware). Available since PHP 4.3.10 and PHP 5.0.3.
• g - shorter of %e and %f .
• G - shorter of %E and %f .
• o - the argument is treated as an integer, and presented as an octal number.
• s - the argument is treated as and presented as a string.
• x - the argument is treated as an integer and presented as a hexadecimal number (with lowercase letters).
• X - the argument is treated as an integer and presented as a hexadecimal number (with uppercase letters).