配列要素を削除する 4 つの PHP メソッドの詳細な説明

<?php
  $array = array(0 => "a", 1 => "b", 2 => "c");
  unset($array[1]);
        //↑ 你想删除的key
?>

Array (
    [0] => a
    [2] => c
)

$array = array_values($array);
/*
输出
array(2) {
 [0]=>
 string(1) "a"
 [1]=>
 string(1) "c"
}
*/

<?php
  $array = array(0 => "a", 1 => "b", 2 => "c");
  array_splice($array, 1, 1);
            //↑ 你想删除的元素的Offset
?>

Array (
    [0] => a
    [1] => c
)

<?php
  $array = array(0 => "a", 1 => "b", 2 => "c");
  $array = array_diff($array, ["a", "c"]);
               //└────────┘→ 你想删除的数组元素值values
?>

<?php

  $array = array(0 => "a", 1 => "b", 2 => "c");
  $array = array_diff_key($array, [0 => "xy", "2" => "xy"]);
                  //↑      ↑ 你想删除的数组键keys
?>