How to replace an element in php array

Replacement method: 1. Reassign the element with the syntax "array[array_search("search value", array)]="replacement value""; 2. Use array_splice(), the syntax "array_splice(array, array_search("value",array),1,"replacement value")".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php array replacement Two methods for an element

1. Reassign the element

Implementation idea: access the element according to the key name and reassign the value

• Use array_search() to search for a key value in the array and return the corresponding key name

• Access the element according to the key name and reassign the value, syntax ：

$数组变量名[键名]=新值;

Example: Replace element "a" with "aa"

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(2,3,"a",4,"b","d");
var_dump($arr);
$key=array_search("a",$arr);
$arr[$key]="aa";
var_dump($arr);
?>

##2. Use array_splice( )Replace elements

array_splice() function is used to delete part of the elements of the array; you can delete them directly or replace them with other values.

Implementation idea:

• Use array_values() to convert the array into an index array

• Use array_search() in the index array Search for a key value in and return the corresponding index value

• Use array_splice() to replace an element starting from the specified index position

Example: Replace element "b" with "bb"

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(2,3,"a",4,"b","d");
var_dump($arr);
$value=array_values($arr);
$index=array_search("b",$value);
array_splice($arr,$index,1,"bb");
var_dump($arr);
?>

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