How to assign variables to the texts in textbox or textarea?

[wxdqz]

I want to "cut and paste" a paragraph or sentence into a textarea.

Then, when I press "submit" button. The text words will assign to differnt variables.

e.g. The sentence is "Hello!, I am Vincent."

Then, variable a[1]="Hello", a[2]="I", a[3]="am" and a[4]="Vincent" etc.

Thank you for help.

Regards,
Vincent.