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PHP basics uses arrays to save data

2022-07-29 10:52:00 【Go home at night】

Functional requirements

Define two arrays , The first array directly assigns values to the array ; The second array specifies the key name and value respectively , And the value of the array will be taken out according to the subscript of the array and the key name of the array .

The sample code

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title> Use an array to save data </title>

</head>



<body>

<?php

  //  Assign values directly to the array 

  $arr1 = array(1, 2, 3, 4, 5, 6, 7, 8, 9);

  //  Specify the key name and value for the array 

  $arr2 = array("animal" => "dog", "color" => "red");

  //  According to the array subscript “3”, get $arr1[2] The value of the element in the array “3”, Output ：3

  echo '$arr1[2] = '.$arr1[2]."<br>";

  //  According to the key name of the array “color”, get $arr2["color"] Elements of array “red”, Output ：red

  echo '$arr2["color"] = '.$arr2["color"]."<br>";

?>

</body>

Running results

Knowledge description

Composite data types include arrays （array） And the object （object） Two kinds of

An array is a collection of data , It organizes a series of data , Form a whole operation . An array can contain a lot of data , Such as scalar data 、 Array 、 object 、 Resources and PHP Other syntax structures supported in .

PHP The data in is actually an ordered mapping . Mapping is a way of putting values（ value ） Related to keys（ Key name ） The type of . Array pass function array() Definition , Its value uses “key => value” How to set , Multiple values are separated by commas . Of course, you can also not use the key name , The default is 0、1、2、3、…….

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当前位置：网站首页>PHP basics uses arrays to save data

PHP basics uses arrays to save data

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