Function Powershell test 2语句（如果函数为true）

有没有办法用If语句检查这两个函数？我想检查一下，如果这两个函数都是真的，

写入主机“程序已安装。”否则写入主机“安装失败”。

我们开始：

Clear-Host
Function First {
    $File1 = "C:\Program Files\WinRAR\WinRAR.exe"
    $TestFile1 = Test-Path $File1
    If ($TestFile1 -eq $True) {Write-Host "Winrar is installed." -F Green -B Black}
    Else {Write-Host "Winrar is not installed." -F Red -B Black}
}
First

Function Second {
    $winrar = Get-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*
    $winrarCheck = "Winrar"
    $winrarFinal = $winrar | Where {$_.DisplayName -match $winrarCheck} | Format-Table -Property DisplayName,DisplayVersion

    $winrarFinal
    If ($winrarFinal) {Write-Host "Winrar registry check installed." -F Green -B Black}
    Else {Write-Host "Winrar registry check failed." -F Red -B Black}
    }
Second

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嗨，先生，请你解释一下这句话好吗？return（$testFileProg-或$x86-或$x64）如果其中一个为true，则函数返回true是否有方法使其中两个为true，返回true？我需要$testfileProg为true，并且$x86或$x64return（$testfileProg-和（$x86-或$x64））中的1是F6a4，这部分代码有什么原因吗。长度-gt 0；？

Function CheckFileInstalled {

    param (
        [string]$pathProg     = "C:\Program Files\WinRAR\WinRAR.exe",
        [string]$nameProg     = "Winrar"
    )

    $testFileProg = Test-Path $pathProg

    $x86 = ((Get-ChildItem "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall") |
        Where-Object { $_.GetValue( "DisplayName" ) -like "*$nameProg*" } ).Length -gt 0;

    $x64 = ((Get-ChildItem "HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall") |
        Where-Object { $_.GetValue( "DisplayName" ) -like "*$nameProg*" } ).Length -gt 0;


    return ( $testFileProg -and ($x86 -or $x64) )

}


if( CheckFileInstalled ) {

    Write-Host "Program installed." 
}
else {
    Write-Host "Failed to install."
}