variant_cmp

(PHP 5, PHP 7)

variant_cmp — Compares two variants

说明

variant_cmp ( mixed $left , mixed $right [, int $lcid [, int $flags ]] ) : int

Compares left with right.

This function will only compare scalar values, not arrays or variant records.

参数

left

The left operand.

right

The right operand.

lcid

A valid Locale Identifier to use when comparing strings (this affects string collation).

flags

flags can be one or more of the following values OR'd together, and affects string comparisons:

**Variant Comparision Flags**
value	meaning
`NORM_IGNORECASE`	Compare case insensitively
`NORM_IGNORENONSPACE`	Ignore nonspacing characters
`NORM_IGNORESYMBOLS`	Ignore symbols
`NORM_IGNOREWIDTH`	Ignore string width
`NORM_IGNOREKANATYPE`	Ignore Kana type
`NORM_IGNOREKASHIDA`	Ignore Arabic kashida characters

Note:

对于所有变量运算函数，本函数的参数可以是 PHP 内置的类型（整数，字符串，浮点数，布尔型或者 NULL），或者是一个 COM，VARIANT 或者 DOTNET 类的实例。PHP 内置类型将会使用和构造VARIANT类相同的规则转换成变量。COM 和 DOTNET 对象的值将会取其默认属性并被当成变量值使用。

变量运算函数是同名函数在 COM 库中的外包；有关此类函数的更多信息参见 MSDN 库。PHP 函数命名有少许区别，例如 PHP 中的 variant_add() 对应于 MSDN 文档中的 VarAdd()。

返回值

Returns one of the following:

**Variant Comparision Results**
value	meaning
`VARCMP_LT`	`left` is less than `right`
`VARCMP_EQ`	`left` is equal to `right`
`VARCMP_GT`	`left` is greater than `right`
`VARCMP_NULL`	Either `left`, `right` or both are `NULL`