php中删除数组元素

<?php
 $users=array("1"=>"张三","2"=>"李四","3"=>"王五");

 print_r($users);

 echo "<br>";

 unset($users["2"]);

 print_r($users);

 echo "<br>";

 $student=array("1"=>"mike","2"=>"tom","3"=>"jerry","4"=>"lucy","5"=>"lili");

 array_splice($student,3);//删除第三个元素后面的所有元素

 

 

 /*
  Array ( [1] => 张三 [2] => 李四 [3] => 王五 )
  Array ( [1] => 张三 [3] => 王五 )
  Array ( [0] => mike [1] => tom [2] => jerry )
 */
?>

 print_r($student); array_splice($student,3,1);//删除第三个元素后面的一个元素 即 删除第四个元素