Answer 1

Answer 2

Answer 3

//试试这个

<?php
//array
$data=array("0" => 0,"1" => 30,"2" => 14);
//print array without apply array_shift function 
echo '<pre>';
print_r($data);
echo '</pre>';

if(end($data) != 0){
    if($data[0] == 0){
        array_shift($data);  
    }
}
//print array with apply array_shift function
echo '<pre>';
print_r($data);
echo '</pre>';
?>



//output
  Array
   (
    [0] => 0
    [1] => 30
    [2] => 14
   )

 Array
 (
   [0] => 30
   [1] => 14
 )

Answer 4

Answer 5

Answer 6