How to add data to an array in php

php method to add data to an array: 1. Use the "array_unshift(array, data value 1, data value 2...)" statement; 2. Use "array_push(array, value 1, value 2. ..)" statement; 3. Use the "array_splice(array, starting position, 0, value)" statement.

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

php adds to the array Data

Method 1: array_unshift() function

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

<?php
$arr=array(10,12,20);
array_unshift($arr,8,"9");
var_dump($arr);
?>

Method 2: array_push() function

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

<?php
$arr=array(10,12,20);
array_push($arr,8,"9",3.14);
var_dump($arr);
?>

Method 3: array_splice() function

array_splice($array,$start,$length,$ value) function is a powerful function that can be used to delete array elements, replace array elements, and also insert array elements (just 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 specify the insertion value (if If it is multiple values, it needs to be set as an array).

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(10,12,20);
array_splice($arr1,0,0,"1");
var_dump($arr1);

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

Method 4: array_pad() function

array_pad($array,$size,$value)The function can insert a certain key value $value into the array $array, thereby filling the array to the specified length $size. (The $size parameter can be understood as the final number of elements in the array, that is, the length of the array after the insertion operation).

<?php
$arr=array(10,12,20);
$result =array_pad($arr,5,1);
var_dump($result);
?>

It can be seen from

array_pad($arr,5,1) that the value of $size is 5, then there are a total of 5 elements in the array after the insertion operation; and the original There are 3 elements, so only 2 elements need to be inserted. And because the inserted value $value is 1, you only need to insert 2 elements with the value "1". Therefore, the output result is:

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