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Php print_r() function is used to print the array elements from array list and which functions also print strings, integer and float.
Just type to a array list like this a,b,c,d now will be store at array then click array print button the out put will display like this Array (  => a  => b  => c  => d )
Following code is array print function code if you need to download and use to your website.
In the above entire array list has been stored in $data variable.Then print_r() function is printing the all array elements from array list.
If you need php array print function code click and download from following link.