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The array_pop function is used to remove the last array element. This function has to use one argument that is array name and also this array function return one returns values.
Just you type a number or character to in the above array list like this a , b ,c ,d .Now will be to store the value for the array. Then click pop button the output will be display like this Array (  => a  => b  => c ) .
if you need to array_pop() function example following code useful to you.
In the above entire array list has been stored in $arrays variable.array_pop() function is used to end of array value remove from a array list.array_pop() function have in one arguments that is array stack.
If you need to array_pop() function code download from following link.