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