How to modify the contents of an array in php

Method: 1. Use "array_values ​​(array)" to change the string key name to a numeric key name; 2. Use "array_replace (array 1, array 2)" to replace the array; 3. Use "array_splice(array, starting position, length, replacement value)" to delete, insert, and replace elements.

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer

php modification array Content method

1. Use array_values() function

array_values() is used to get the values ​​of all elements in the array

Use array_values() to change the string key name of the associative array into a numeric key name

<?php 
header("content-type:text/html;charset=utf-8");
$arr=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
var_dump($arr);
var_dump(array_values($arr));
?>

2, array_replace() function

array_replace() function replaces the value of the first array with the value of the subsequent array.

<?php 
header("content-type:text/html;charset=utf-8");
$a1=array("red","green");
$a2=array("blue","yellow");
var_dump($a1);
var_dump(array_replace($a1,$a2));
?>

3. Use array_splice() function

array_splice() is a powerful array function that can be set according to different parameters Implement operations of deleting elements, adding elements, and replacing elements.

Example 1: Delete element

<?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($arr,1,2);
echo "从第2位开始删除2个元素：";
var_dump($arr);
?>

Example 2: Replace element

<?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($arr,1,1,"hello");
echo "替换第2个元素：";
var_dump($arr);
?>

Example 3 : Insert element

<?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($arr,1,0,"hello");
echo "在第1个元素后插入一个元素：";
var_dump($arr);
?>

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