ZeroUnitsSniff.php

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<?php
namespace Magento\Sniffs\Less;

use PHP_CodeSniffer\Sniffs\Sniff;
use PHP_CodeSniffer\Files\File;

class ZeroUnitsSniff implements Sniff
{
    const CSS_PROPERTY_UNIT_PX = 'px';
    const CSS_PROPERTY_UNIT_EM = 'em';
    const CSS_PROPERTY_UNIT_REM = 'rem';

    private $units = [
        self::CSS_PROPERTY_UNIT_PX,
        self::CSS_PROPERTY_UNIT_EM,
        self::CSS_PROPERTY_UNIT_REM,
    ];

    public $supportedTokenizers = [TokenizerSymbolsInterface::TOKENIZER_CSS];

    public function register()
    {
        return [T_LNUMBER, T_DNUMBER];
    }

    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();
        $tokenCode = $tokens[$stackPtr]['code'];
        $tokenContent = $tokens[$stackPtr]['content'];

        $nextToken = $tokens[$stackPtr + 1];

        if (T_LNUMBER === $tokenCode
            && "0" === $tokenContent
            && T_STRING === $nextToken['code']
            && in_array($nextToken['content'], $this->units)
        ) {
            $phpcsFile->addError('Units specified for "0" value', $stackPtr, 'ZeroUnitFound');
        }

        if ((T_DNUMBER === $tokenCode)
            && 0 === strpos($tokenContent, "0")
            && ((float)$tokenContent < 1)
        ) {
            $phpcsFile->addError('Values starts from "0"', $stackPtr, 'ZeroUnitFound');
        }
    }
}