variant_mul Multiplies the values of the two variants php函数


(PHP 5)

variant_mulMultiplies the values of the two variants


mixed variant_mul ( mixed $left , mixed $right )

Multiplies left by right.



The left operand.


The right operand.

Boolean values are converted to -1 for FALSE and 0 for TRUE.


As with all the variant arithmetic functions, the parameters for this function can be either a PHP native type (integer, string, floating point, boolean or NULL), or an instance of a COM, VARIANT or DOTNET class. PHP native types will be converted to variants using the same rules as found in the constructor for the VARIANT class. COM and DOTNET objects will have the value of their default property taken and used as the variant value.

The variant arithmetic functions are wrappers around the similarly named functions in the COM library; for more information on these functions, consult the MSDN library. The PHP functions are named slightly differently; for example variant_add() in PHP corresponds to VarAdd() in the MSDN documentation.


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


  • variant_div() - Returns the result from dividing two variants
  • variant_idiv() - Converts variants to integers and then returns the result from dividing them

variant_neg Performs logical negation on a variant
variant_not Performs bitwise not negation on a variant
variant_or Performs a logical disjunction on two variants
variant_pow Returns the result of performing the power function with two variants
variant_round Rounds a variant to the specified number of decimal places
variant_set Assigns a new value for a variant object
variant_set_type Convert a variant into another type "in-place"
variant_sub Subtracts the value of the right variant from the left variant value
variant_xor Performs a logical exclusion on two variants
var_dump 打印变量的相关信息
var_export 输出或返回一个变量的字符串表示
version_compare Compares two "PHP-standardized" version number strings
vfprintf 将格式化字符串写入流
virtual Perform an Apache sub-request

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