Here is simple requirements

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1. Get the last char of a string in PHP

If you want to get the only one character in a string, here is simplest function to do.

substr("testers", -1); // returns "s"

So simple?

And what if you want 2 characters? Let ‘s do this

substr("testers", -2); // returns "rs"

 2. Remove the last character from string

Just a bonus if this article, if you want to remove the last character in a string. You can do this function

substr("a,b,c,d,e,", 0, -1);

The output is a,b,c,d,e

Hope this article help you solve the problem with string.

Thanks

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It ‘s very simple, you just need to run this wayway

function getIDFromYoutubeURL($url){
        $video_id = false;
        if (preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', $url, $match)) {
            $video_id = $match[1];
        }
        return $video_id;
    }

Now let ‘s use function like this

$youtubeID = getIDFromYoutubeURL("https://www.youtube.com/watch?v=_URzW7CH8Dg");

// $youtubeID = _URzW7CH8Dg

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My problem with PHP in number prefix 0

My customer want to generate the number like this

<year-4 digits><class name-string><ID – 4 digits>

With ID need to generate auto increase, if it is not enough 4 digits then put “0” as prefix to get it enough. It will look like this

201410A10013

Year: 2014

Class name: 10A1

ID: 0013

What we need to do is finding a good way to put “0” for enough 4 digits.

My solution

Ok, and this is the way I do, it ‘s very simple

$studentID =  $Y . $C . sprintf("%04s",   $ID);

With $studentID is the final result

$Y is the current year. You can generate it easy

$Y = date(‘Y’);

$C is the class name, you get it from your system.

And $ID is the number you generate from your system. You need to make sure it ‘s string before doing this.

$ID .= “”;

Final PHP code

$Y = date('Y');

$C = "10A1"; // change to your class

$ID = 13; // change to your ID

$ID .= ""; // make sure it 's string

$studentID =  $Y . $C . sprintf("%04s",   $ID);

Enjoy and good luck

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Today, when I try to remove a value out of an array and figured out the best way to do. Here is my simple code:

Above code, I want to remove a knew value of device_id out of a device_ids list. It ‘s quite simple and save us a lot of time to use foreach statement.

Hope it help.

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First of all, if you worry about the PHP version or what people are talking about this, you can follow this link on PHP official page http://php.net/manual/en/function.round.php

Now, let ‘s start

1. Round number in PHP

It ‘s easier than you thought, we have some basic ways to use it here

echo round(9.5, 0, PHP_ROUND_HALF_UP); // 10
echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9
echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10
echo round(9.5, 0, PHP_ROUND_HALF_ODD); // 9

Keep in mind that, the difference from round and format is the value. When you try to format a number, it only mean you show it to user the different way, but when you use round, you already change the value to value you want. We will talk more about format later, here if you want to get 3 numbers after decimal point, you can use like this

ceil( 2.412345 * 1000)/1000;

It will give you 2.412

I think that ‘s all you need to round a number in PHP

2. Format number in PHP

Let ‘s continue with format number in PHP by an simple example

$number = 1234.56;

// english notation (default)
$english_format_number = number_format($number);
// 1,235

// French notation
$nombre_format_francais = number_format($number, 2, ',', ' ');
// 1 234,56

$number = 1234.5678;

// english notation without thousands separator
$english_format_number = number_format($number, 2, '.', '');
// 1234.57

And I believe you know how to use after looking at this example.

By this article, I hope to help you solve almost issue about Round and Format number in PHP.

Good luck!

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