PHP sscanf() 函数

解析一个字符串：

<?php
$str = "age:30 weight:60kg";
sscanf($str,"age:%d weight:%dkg",$age,$weight);
// show types and values
var_dump($age,$weight);
?>

sscanf() 函数根据指定的格式解析字符串的输入。 sscanf() 函数根据格式字符串将字符串解析为变量。

如果仅向此函数传递两个参数，则数据将以数组形式返回。否则，如果传递可选参数，则解析的数据将存储在其中。如果说明符多于包含它们的变量，则会发生错误。但是，如果说明符少于变量，则多余的变量将包含 NULL。

语法

sscanf( string,format,arg1,arg2,arg++)

Parameter	Description
string	Required. Specifies the string to read
format	Required. Specifies the format to use. Possible format values: %% - Returns a percent sign %c - The character according to the ASCII value %d - Signed decimal number (negative, zero or positive) %e - Scientific notation using a lowercase (e.g. 1.2e+2) %u - Unsigned decimal number (equal to or greather than zero) %f - Floating-point number %o - Octal number %s - String %x - Hexadecimal number (lowercase letters) %X - Hexadecimal number (uppercase letters) Additional format values. These are placed between the % and the letter (example %.2f): + (Forces both + and - in front of numbers. By default, only negative numbers are marked) ' (Specifies what to use as padding. Default is space. Must be used together with the width specifier. Example: %'x20s (this uses "x" as padding) - (Left-justifies the variable value) [0-9] (Specifies the minimum width held of to the variable value) .[0-9] (Specifies the number of decimal digits or maximum string length) Note: If multiple additional format values are used, they must be in the same order as above.
arg1	Optional. The first variable to store data in
arg2	Optional. The second variable to store data in
arg++	Optional. The third, fourth, and so on, to store data in

返回值：	如果仅向此函数传递两个参数，则数据将以数组形式返回。否则，如果传递可选参数，则解析的数据将存储在其中。如果说明符多于包含它们的变量，则会发生错误。但是，如果说明符少于变量，则多余的变量将包含 NULL。
PHP 版本：	4.0.1+