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PHP one-dimensional array sorting method_PHP tutorial

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Jul 13, 2016 am 10:29 AM

php one world exist imagine sort array method Reality Life program still important order

Whether in real life or in the programming world, order is always important - I can’t imagine a world without order! PHP arrays are no exception. PHP provides four sets of functions for sorting PHP arrays. The first three are for one-dimensional arrays. Let's talk about these three first. The fourth sorting of multi-dimensional arrays will be discussed in the next article. That one is a bit complicated.

The first group: sort and rsort, sort according to the order asc and reverse order desc of the PHP array key value, while destroying the index relationship of the original array - in fact, re-establishing the numerical index starting from 0 after deleting the index. Take a look at the routine:

<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,0); FONT-WEIGHT: bold; PADDING-TOP: 0px"><?php</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span> <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">=</span> <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">array</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,255); PADDING-TOP: 0px">"a"</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">=></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">1</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">,</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">2</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">sort</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">var_dump</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
 
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">rsort</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">var_dump</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,0); FONT-WEIGHT: bold; PADDING-TOP: 0px">?></span>

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Look at the first output result, the first output:

array(2) {

　[0]=>

int(1)

　[1]=>

int(2)

　}

Second output:

array(2) {

　[0]=>

int(5)

　[1]=>

int(4)

　}

I found that where did the index a that we originally defined go? Where did it go? It can be said for sure that it was ruthlessly deleted by them. If you don’t care about the original index relationship, you can use them!

The second set of functions: asort and arsort. These two functions are more powerful. As long as they can retain the original index relationship of the array, replace the sort and rsort in the above example with these two functions. See Running result:

array(2) {

　["a"]=>

int(1)

　[0]=>

int(2)

　}

array(2) {

　[0]=>

int(2)

　["a"]=>

int(1)

　}

This is easy to understand at a glance, so there’s no need to explain it!

The third group of PHP array sorting functions: krsort and ksort. These two are different from the above two groups. These two functions sort the key names. You can replace the functions in the above example with these two to see the details. I won’t talk about the running results here, otherwise this article would be too long. I’m afraid some brothers won’t have the patience to read the key points of this article, although the key points are below!

Sort PHP arrays through custom functions. There are three functions:

　uasort sorts the key values of the PHP array through a custom function and retains the original index relationship.

uksort sorts the key names of the PHP array through a custom function and retains the original index relationship.

usort sorts the key values of the PHP array through a custom function, deletes the original index relationship, and creates a new index from scratch.

This place certainly needs an example:

<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px"><!--</span>p
<span style="PADDING-BOTTOM: 0px; FONT-STYLE: italic; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(102,102,102); PADDING-TOP: 0px">//首先顶一个函数，这个函数需要接受两个参数,并且返回值是一定的</span>
<span style="PADDING-BOTTOM: 0px; FONT-STYLE: italic; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(102,102,102); PADDING-TOP: 0px">//第一个参数等于第二个参数的时候返回0，小于的时候返回-1，大于返回1</span>
 
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,0); FONT-WEIGHT: bold; PADDING-TOP: 0px">function</span> cmp<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">,</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$b</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">{</span>
 <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">+=</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">1</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
 <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$b</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">+=</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">3</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span><span style="PADDING-BOTTOM: 0px; FONT-STYLE: italic; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(102,102,102); PADDING-TOP: 0px">//改变这些值之后进行比较</span>
 
 <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(177,177,0); PADDING-TOP: 0px">if</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">==</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$b</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span> <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(177,177,0); PADDING-TOP: 0px">return</span> <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">0</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
 <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(177,177,0); PADDING-TOP: 0px">return</span> <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">&</span>lt<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$b</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span>?<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">-</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">1</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">:</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">1</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">}</span>
 
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span> <span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">=</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">array</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">1</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">,</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">4</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">,</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">3</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">,</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(204,102,204); PADDING-TOP: 0px">5</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">uasort</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">,</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,255); PADDING-TOP: 0px">'cmp'</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(153,0,0); PADDING-TOP: 0px">var_dump</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">(</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,0,136); PADDING-TOP: 0px">$a</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(0,153,0); PADDING-TOP: 0px">)</span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">;</span>
<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(51,153,51); PADDING-TOP: 0px">--></span>

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Output result:

array(4) {

　[0]=>

int(1)

　[3]=>

int(5)

　[1]=>

int(4)

　[2]=>

int(3)

　}

, haha... Is it more messy than not sorting? We are just demonstrating the methods used here. You can do it yourself when you use it! If you do not operate these values before comparing them, for example, here we :

$a+=1;

　$b+=3;//Compare after changing these values

Then you might as well just use sort, right?

I won’t talk about the other two. Later, Battlefield will do some experiments on PHP sorting multi-dimensional arrays, and then tell everyone the results and process. Wait a moment!

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A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

7 PHP Functions I Regret I Didn't Know Before Nov 13, 2024 am 09:42 AM

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

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