如何在PHP中基于键删除数组元素？

给定一个数组(一维或多维), 任务是根据键值删除数组元素。

例子：

Input: Array
       (   
           [0] => 'G' 
           [1] => 'E'
           [2] => 'E'
           [3] => 'K'
           [4] => 'S'
       )
       Key = 2
Output: Array
        (   
            [0] => 'G' 
            [1] => 'E'
            [3] => 'K'
            [4] => 'S'
        )

使用unset()函数:unset()函数用于从数组中删除元素。 unset函数用于销毁任何其他变量, 并以相同的方式删除数组的任何元素。此unset命令将数组键作为输入, 并从数组中删除该元素。删除后, 关联的键和值不会更改。

语法如下：

unset($variable)

参数：该函数接受单个参数变量。它是必填参数, 用于取消设置元素。

程序1：从一维数组中删除元素。

<?php
//PHP program to delete an array 
//element based on index
  
//Declare arr variable
//and initialize it
$arr = array ( 'G' , 'E' , 'E' , 'K' , 'S' );
  
//Display the array element
print_r( $arr );
  
//Use unset() function delete
//elements
unset( $arr [2]);
  
//Display the array element
print_r( $arr );
  
?>

输出如下：

Array
(
    [0] => G
    [1] => E
    [2] => E
    [3] => K
    [4] => S
)
Array
(
    [0] => G
    [1] => E
    [3] => K
    [4] => S
)

程序2：从关联数组中删除一个元素。

<?php 
  
//PHP program to creating two 
//dimensional associative array 
$marks = array ( 
      
     //Ankit will act as key 
     "Ankit" => array ( 
          
         //Subject and marks are 
         //the key value pair 
         "C" => 95, "DCO" => 85, ), //Ram will act as key 
     "Ram" => array ( 
          
         //Subject and marks are 
         //the key value pair 
         "C" => 78, "DCO" => 98, ), //Anoop will act as key 
     "Anoop" => array ( 
          
         //Subject and marks are 
         //the key value pair 
         "C" => 88, "DCO" => 46, ), ); 
  
echo "Before delete the element <br>" ;
  
//Display Results
print_r( $marks ); 
  
//Use unset() function to
//delete elements
unset( $marks [ "Ram" ]);
  
echo "After delete the element <br>" ;
  
//Display Results
print_r( $marks ); 
  
?>

输出如下：

Before delete the element Array
(
    [Ankit] => Array
        (
            [C] => 95
            [DCO] => 85
        )

    [Ram] => Array
        (
            [C] => 78
            [DCO] => 98
        )

    [Anoop] => Array
        (
            [C] => 88
            [DCO] => 46
        )

)
After delete the element Array
(
    [Ankit] => Array
        (
            [C] => 95
            [DCO] => 85
        )

    [Anoop] => Array
        (
            [C] => 88
            [DCO] => 46
        )

)

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