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In the php array_reverse() functions is used to reverse array elements from array list. which functions are in two arguments that are array input and bool preserve keys.In the array input arguments you must give and bool preserve keys is optional .it functions is returns true or false outputs.
Just type a number or character to Array List like this a , b ,c ,d .Now will be to store the value for array .then click reverse button the output will be display like this Array (  => d  => c  => b  => a ) .
if you need to array_reverse() function example following code useful to you.
In the above entire array list has been stored in $numbers variable.array_reverse() function is used to reverse the array value from a array list.array_reverse() function have in two arguments that is array input,[bool preserve keys].
If you need to array_reverse() function code download from following link.