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how to use model?

i replace return with echo. and it loops,
what is the difference between echo and return.

return breaks the loop. You have to move the return outside the loop.

I suggest you first learn to see what is happening and make logical deductions before you start asking questions.

Echo is a bad practice to use in functions because it creates output on the spot. if you add a function that uses echo in your controller before you call the view the output of the echo will be above the view.

I really think you should learn the basics of programming before you start developing complex functions.

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