โปรดตรวจสอบว่าอยู่ในจำนวนมี 5 อยู่ในนั้น php

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พิสูจน์ความถูกต้องของจำนวนควรจะโดย 12 ตัวเลขใน php

/^$|^[0-9]{12}$/

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