{"id":3648,"date":"2020-05-29T00:27:00","date_gmt":"2020-05-28T15:27:00","guid":{"rendered":"https:\/\/katblog.manadream.net\/?p=3648"},"modified":"2020-10-07T15:47:28","modified_gmt":"2020-10-07T06:47:28","slug":"what-are-array","status":"publish","type":"post","link":"https:\/\/katblog.manadream.net\/index.php\/2020\/05\/29\/what-are-array\/","title":{"rendered":"[PHP]What are Arrays?[Programming for Kids and Above #4]"},"content":{"rendered":"

Hello!<\/p>\n

I’m kat, the manager of ‘kat’s blog.’<\/p>\n

This time, which is the fourth installment of the ‘Programming Lessons’ series, I will be talking about arrays.<\/p>\n

In my last article<\/a>, we tried entering one value in one variable, but actually you can also enter multiple values<\/span>.<\/p>\n

Let’s learn how to do that this time!<\/p>\n\n\n

What we will use this time<\/strong><\/h2>\n\n\n

The programming language we will use this time<\/div>

<\/p>\n

This time we will use the following programming language to write out a program.<\/p>\n

\n

\u30fbPHP<\/p>\n<\/div>\n

<\/p><\/div><\/p>\n

The programming environment we will use this time<\/div>

<\/p>\n

Let’s use the paiza website which is listed below for executing the program.<\/p>\n

paiza website<\/a><\/span><\/span><\/p>\n

For those who are doing this for the first time, the way to use it is listed in the page below, so please check it out.<\/p>\n

https:\/\/katblog.manadream.net\/index.php\/2020\/06\/09\/how-to-use-paiza-io\/<\/p>\n

<\/p><\/div><\/p>\n\n\n

What are arrays?<\/h2>\n\n\n

I mentioned at the beginning, but arrays<\/span> are variables which can hold multiple values<\/span>.<\/p>\n\n\n

How to enter values<\/h3>\n\n\n

In the case of regular variables;<\/p>\n\n

\n$number = 1;\n<\/pre><\/div>\n\n
you enter only one value like shown above,<\/p>\n
however for an array,<\/p>\n\n
\n$numbers = [1, 2, 3];\n<\/pre><\/div>\n\n
like shown above, you write in multiple values inside the [], while separating them with a ‘,’.<\/p>\n
Also, you can write it out as,<\/p>\n\n
\n$numbers = array(1, 2, 3);\n<\/pre><\/div>\n\n
Even though how it is written is different, the meaning is the same as when we wrote it inside the [].<\/p>\n\n\n
How to acquire values<\/h3>\n\n\n
When acquiring values from normal variables, usually you can do this just by writing out the variable. However, in the case of arrays you need to attach a number after the variable. This number, such as [0] or [1], needs to be the number which has the value you wish to take (the number tells which order the value is in).<\/span><\/p>\n\n\n
\n\n\n
In the case of regular variables;<\/p>\n\n
\n<?php\n\n$number = 1;\necho $number;  \/\/ is the regular way to acquire variables.\n<\/pre><\/div>\n\n
The execution result will be displayed as ‘1’.<\/p>\n\n\n<\/div>\n\n\n\n
\n\n\n
How to acquire values from arrays<\/p>\n\n
\n<?php\n\n$numbers = [1, 2, 3];   \/\/ in the zero position is the value '1,' in the one position is '2,' and in the two position is '3.'\necho $numbers[1];       \/\/ this is acquiring the number one value '2.'\n<\/pre><\/div>\n\n
As some of you might have noticed already, the numbers start from zero<\/span>.<\/p>\n
So, because [1] is selected above, the number one<\/span> value, ‘2’<\/span> will be displayed on the screen.<\/p>\n\n\n<\/div>\n\n\n
<\/i><\/div>
The [0(zero)], [1], which is put after an array, is called a ‘key<\/span>‘ in programming terminology.<\/p>\n
For instance, the keys<\/span> are 0,1,2 in the case of $numbers = [1, 2, 3].<\/p>\n
This phrase is used very often, so let’s try to remember it!<\/div><\/div><\/p>\n\n\n
Let’s enter letters into a value<\/h3>\n\n\n
You can put in letters<\/span> as well as numbers<\/span> into variables.<\/p>\n
The way to do this is almost the same as if you were putting in numbers, but you will need to surround the value with ‘(quotations)<\/span> or with “(double quotations)<\/span>.<\/p>\n
Now then, let’s try entering letters both into a variable as well as in an array.<\/p>\n\n\n
\n\n\n
In the case of regular variables,<\/p>\n\n
\n<?php\n\n$fruit = "apple";\necho $fruit;         \/\/ "apple" is how it will be displayed.\n<\/pre><\/div>\n\n
\"\"<\/p>\n
In the case of an array;<\/p>\n\n
\n<?php\n\n$fruits = ["apple", "orange", "banana", "strawberry"];\necho $fruits[1];        \/\/ "orange" is how it would be displayed.\n<\/pre><\/div>\n\n
\"\"<\/p>\n\n\n<\/div>\n\n\n\n
Final thoughts<\/h2>\n\n\n
We talked about arrays this time. They are used just as much as regular variables, so please make sure to remember them.<\/p>\n
Next time, I’ll be talking about associative arrays<\/span><\/strong>. They are easier to use than arrays, so please look forward to it!<\/p>\n
See you next time!<\/p>\n\n\n
\n\n\n\n
\n
\n
<< Proceed to previous article<\/a><\/div>\n<\/div>\n\n\n\n
\n
Proceed to next article >><\/a><\/div>\n\n\n\n
<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Hello! I#8217;m kat, the manager of #8216;kat#8217;s blog.#8217; This time, which is the fourth installmen<\/p>\n","protected":false},"author":1,"featured_media":4141,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_locale":"ja","_original_post":"https:\/\/katblog.manadream.net\/?p=3648","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[102],"tags":[107,108],"class_list":["post-3648","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming-lessons","tag-english","tag-programming","ja"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/katblog.manadream.net\/wp-content\/uploads\/2019\/07\/balloon.png","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paUgnN-WQ","_links":{"self":[{"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/posts\/3648"}],"collection":[{"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/comments?post=3648"}],"version-history":[{"count":29,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/posts\/3648\/revisions"}],"predecessor-version":[{"id":3731,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/posts\/3648\/revisions\/3731"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/media\/4141"}],"wp:attachment":[{"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/media?parent=3648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/categories?post=3648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/katblog.manadream.net\/index.php\/wp-json\/wp\/v2\/tags?post=3648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}