How to remove an element from an array based on key value in php

php method to remove elements from an array based on key values: 1. Use the array_search() function to search for the specified key value in the array and return the corresponding key name. The syntax is "array_search(specified key name, $arr, true);"; 2. Use the unset() function to delete the specified array element based on the obtained key name, the syntax is "unset($array variable name[key name])".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

php according to the key value Method to remove an element from an array

Implementation idea:

• Get the corresponding key name based on the key value

• Use the key name to access the specified array element and delete the element

Implementation steps:

1. Use the array_search() function to get the key name

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("a"=>"red","b"=>"green","c"=>"blue");
var_dump($arr);
$key=array_search("red",$arr,true);
echo "对应的键名：".$key;
?>

##2. Use the unset() function to delete elements based on the key name

unset($arr[$key]);
var_dump($arr);

Description:

$Array variable name [key name] Statement is used to access the specified element

Extended knowledge:

• array_search() function searches for a key value in the array and returns the corresponding key name.

array_search(value,array,strict)

ParametersDescriptionRequired. Specifies the key value to search for in the array. Required. Specifies the array to be searched. Optional. If this parameter is set to TRUE, the function searches the array for elements of the same data type and value. Possible values:

value
array
strict	true false - default If set to true, the type of the given value in the array is checked, the number 5 and the string 5 are different (see Example 2).

Return value: If the specified key value is found in the array, return the corresponding key name, otherwise return FALSE. If a key value is found more than once in the array, the key name matching the first found key value is returned.​

• #unset() function is used to destroy the given variable.
  Note: This function has no return value.

If you unset() a global variable in a function, only the local variable will be destroyed, and the variables in the calling environment will retain the same value before calling unset().

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