How to put several data into an array in php

4 methods: 1. Directly assign values ​​to array elements without specifying key names, the syntax is "$array name[]=value 1;$array name[]=value 2;..."; 2. Use array_unshift(), the syntax is "array_unshift(array, value 1, value 2...)"; 3. Use array_push(), the syntax is "array_push(array, value 1, value 2...)"; 3. Use " array_splice(array, position, 0, array(value 1, value 2...))" statement.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php puts several data into the array, that is Insert multiple data into the array. Here are several insertion methods.

Method 1: Directly assign values ​​to array elements without specifying key names

We can pass the array variable name in the form of "$ [Subscript] = value;" format to initialize the array

When we do not specify a specific index value (subscript) within square brackets, the default is a numeric index, and the index value defaults from 0 Start to increase gradually.

<?php 
header("content-type:text/html;charset=utf-8");
$arr=array(10,12,20);
var_dump($arr);
$arr[]="hello";
$arr[]=8;
$arr[]=9;
echo "插入多个数据后：";
var_dump($arr);
?>

Method 2: Use the array_unshift() function to insert multiple data at the beginning of the array

array_unshift($array,$value1,$value2...)The function can insert one or more new elements (key values) at the beginning of the array.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
$arr=array(10,12,20);
var_dump($arr);
array_unshift($arr,8,"9");
echo "插入多个数据后：";
var_dump($arr);
?>

Method 3: Use the array_push() function to insert multiple data at the end of the array

array_push($array,$value1,$value2...)The function can insert one or more elements (key values) at the end of the array.

<?php 
header("content-type:text/html;charset=utf-8");
$arr=array(10,12,20);
var_dump($arr);
array_push($arr,8,"9",3.14);
echo "插入多个数据后：";
var_dump($arr);
?>

Method 4: Use array_splice() function to insert multiple data (any position) in the array

array_splice($array,$start,$length,$value)The function is a powerful function that can be used to delete array elements, replace array elements, and also insert array elements (only You need to set the parameter $length to 0).

When $length=0, then the parameter $start can specify the position (subscript) to start inserting, and the parameter $value can The insertion value can be specified (if there are multiple values, it needs to be set as an array).

• $start value is 0, then insert

• $start value at the beginning. "Array length value", then insert

• $start value at the end >0 and in the middle

Note: The array_splice() function will change the original array

<?php 
header("content-type:text/html;charset=utf-8");
$arr1=array(10,12,20);
var_dump($arr1);
echo "插入多个数据后：";
array_splice($arr1,0,0,array("1","hello","3"));
var_dump($arr1);

$arr2=array(10,12,20);
array_splice($arr2,1,0,array("1",25,"3"));
var_dump($arr2);

$arr3=array(10,12,20);
array_splice($arr3,count($arr3),0,array("1",25,"3"));
var_dump($arr3);
?>

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