variant_mul
(PHP 5)
variant_mul —
multiplies the values of the two variants and returns the result
Description
mixed variant_mul
( mixed $left
, mixed $right
)
Multiplies left
by right
and
returns the result, subject to the following rules:
Variant Multiplication Rules
| If |
Then |
| Both expressions are of the string, date, character, boolean type |
Multiplication |
| One expression is a string type and the other a
character |
Multiplication |
| One expression is numeric and the other is a string |
Multiplication |
| Both expressions are numeric |
Multiplication |
| Either expression is NULL |
NULL is returned |
| Both expressions are empty |
Empty string is returned |
Boolean values are converted to -1 for FALSE and 0 for TRUE.
See also variant_div(),
variant_idiv().
Note:
对于所有的变量算法函数，此函数的参数可以要么是 PHP
自身的类型（整型，字符串，浮点型，布尔型或者
NULL），要么是一个 COM，VARIANT 或 DOTNET 类的实例。PHP
自身类型将被转换为变量，使用与 VARIANT
类的构造函数中相同的规则。COM 和 DOTNET 对象将具有其默认属性的值，取得并作为变量值使用。
变量算法函数是 COM 库中与其名称接近的函数的封装。此类函数的更多信息请参考
MSDN 库。PHP 函数命名有少许不同，例如 PHP 中的
variant_add() 对应于 MSDN 文档中的 VarAdd()。