Labor Code's Bias in Favor of Labor; Unconstitutional?

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Does the Labor Code (PD 442) have bias in favor of labor? If so, does this mean that it should be declared unconstitutional?

Article 3. Declaration of basic policy. The State shall afford protection to labor, promote full employment, ensure equal work opportunities regardless of sex, race or creed and regulate the relations between workers and employers. The State shall assure the rights of workers to self-organization, collective bargaining, security of tenure, and just and humane conditions of work.

Article 4. Construction in favor of labor. All doubts in the implementation and interpretation of the provisions of this Code, including its implementing rules and regulations, shall be resolved in favor of labor.