How to modify a value in an array in php

Two modification methods: 1. Access the specified array element and reassign the value, the syntax is "array name [subscript] = new value;" or "array name ["key name"] = new value;"; 2. Use array_splice() to replace a specified element starting from the specified position, the syntax is "array_splice(array, starting position, 1, replacement value)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php modification array Two methods for a value

Method 1: Access the specified array element and reassign the value

Syntax:

数组名[下标]=新值; //索引数组
数组名["键名"]=新值; //关联数组

Example 1:

<?php
$arr=array(1,2,3,4,5,6);
var_dump($arr);
$arr[2]="h";
var_dump($arr);
?>

Example 2:

<?php
$arr=array("a"=>"red","b"=>"green","c"=>"blue");
var_dump($arr);
$arr["b"]=23;
var_dump($arr);
?>

Method 2: Using array_splice()

Use array_splice() to modify a value in the array by replacing a specified element from a specified position.

<?php 
header("content-type:text/html;charset=utf-8");
$arr=array(1,2,3,4,5,6,7,8,9,10);
echo "原数组：";
var_dump($arr);
array_splice($arr,1,1,"hello");
echo "修改第2个元素：";
var_dump($arr);
?>

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