php-Arrays function-array_unshift-insert one or more cells at the beginning of the array_PHP tutorial

array_unshitf() inserts one or more cells at the beginning of the array

【Function】
This function inserts the passed in unit to the beginning of the specified array
                                                              Note that the cells are inserted as a whole, so the incoming cells will maintain the same order
            All numerical key names will be modified to count again from zero, and all text key names will remain unchanged
                                                                    Finally, return the new number of cells in the array
【Scope of use】
​​​​​ php4, php5.
【Use】
int array_unshift( array &array,mixed var[,mixed...] )
& Array/Necessary/The original array of the operation of the operation
        var/required/value to be added
【Example】
[php]
$array=array("orange","banana");
var_dump(array_unshift($array,'apple','raspberry'));
var_dump($array);
/*
int(4)
array(4) {
[0]=>
string(5) "apple"
[1]=>
string(9) "raspberry"
[2]=>
string(6) "orange"
[3]=>
string(6) "banana"
}
*/

Excerpted from zuodefeng’s notes