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1.ecs 中的比较运算符
switch (strtolower($token))
{
    case ‘eq‘:
        $token = ‘==‘;
        break;

    case ‘ne‘:
    case ‘neq‘:
        $token = ‘!=‘;
        break;

    case ‘lt‘:
        $token = ‘<‘;
        break;

    case ‘le‘:
    case ‘lte‘:
        $token = ‘<=‘;
        break;

    case ‘gt‘:
        $token = ‘>‘;
        break;

    case ‘ge‘:
    case ‘gte‘:
        $token = ‘>=‘;
        break;

    case ‘and‘:
        $token = ‘&&‘;
        break;

    case ‘or‘:
        $token = ‘||‘;
        break;

    case ‘not‘:
        $token = ‘!‘;
        break;

    case ‘mod‘:
        $token = ‘%‘;
        break;

    default:
        if ($token[0] == ‘$‘)
        {
            $token = $this->get_val(substr($token, 1));
        }
        break;
}

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原文：http://www.cnblogs.com/da-guang/p/4950478.html