How to delete array elements based on key in PHP

Given an array (one or more dimensions), the task is to delete an array element based on the key value.

The example is as follows:

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

Use the unset() function: The unset() function is used to delete elements from an array. The unset function is used to destroy any other variable and is also used to delete any element of an array. This unset command takes an array key as input and removes the element from the array. After deletion, the associated keys and values ​​do not change.

Syntax:

unset($variable)

Parameters: This function accepts a single parameter variable. It is a required parameter and is used to unset the element.

Procedure 1: Remove elements from a one-dimensional array.

<?php 
$arr = array(&#39;G&#39;, &#39;E&#39;, &#39;E&#39;, &#39;K&#39;, &#39;S&#39;);  
print_r($arr);  
unset($arr[2]); 
print_r($arr); 
  
?>

Output:

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

Program 2: Remove elements from an associative array.

<?php   
$marks = array(     
    "Ankit" => array(                   
        "C" => 95,  
        "DCO" => 85,  
    ),            
   
    "Ram" => array(            
        "C" => 78,  
        "DCO" => 98,  
    ),  
       
    "Anoop" => array(            
        "C" => 88,  
        "DCO" => 46,  
    ),  
);    
echo "删除元素前 <br>";   
print_r($marks);  
 
unset($marks["Ram"]);   
echo "删除元素后 <br>";   

print_r($marks);  
  
?>

Output:

删除元素前 
Array
(
    [Ankit] => Array
        (
            [C] => 95
            [DCO] => 85
        )

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

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

)
删除元素后
Array
(
    [Ankit] => Array
        (
            [C] => 95
            [DCO] => 85
        )

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

)

Recommendation: "PHP Tutorial"

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