The blogger has written PHP for a period of time before, but the overall feeling was that it was to complete a specific function. He did not go into the syntax too much and was not familiar with many PHP functions. Therefore, today I will make a brief summary of these things~ (I will not write all the ways, I will only use the most common and concise way)
Array Chapter
After preliminary reading of PHP arrays, I feel that this is actually Far beyond the scope of arrays. I feel that PHP arrays have some characteristics of vector+map in C++ STL. Even this is not enough to summarize its capabilities. Its built-in functions can add or remove elements from the head of the array and add and remove elements from the tail. You can determine unique array elements, count the occurrence frequency of arrays, and sort arrays. Even merge arrays, or make the values of one array the keys of another, or split it. You can also find intersections, difference sets, or return several random values, or you can "shuffle" the cards.
This is completely different from the C++ and Java I have come into contact with before. Arrays bear the majority of PHP data structures. . In other words, the language itself has very few data structures at all?
If you want to see all the functions, go here.
Let’s start with the most basic one that best matches the characteristics of arrays
key is a number
<code><span>$state</span>=<span>array</span>(<span>0</span>=><span>"Alabama"</span>,<span>1</span>=><span>"Alaska"</span>,<span>2</span>=><span>"Wyoming"</span>); 当然这样也可以<span>$state</span>=<span>array</span>(<span>"Alabama"</span>,<span>"Alaska"</span>,<span>"Wyoming"</span>);</code>
key is a string
<code><span>$state</span>=<span>array</span>(<span>"English"</span>=><span>"s"</span>,<span>"Spanish"</span>=><span>"p"</span>);</code>
two-dimensional array
There is no two-dimensional array in PHP, but it can be implemented this way.
<code><span>$ps</span>=<span>array</span>(<span>array</span>(<span>1</span>,<span>2</span>,<span>3</span>),<span>array</span>(<span>4</span>,<span>5</span>,<span>6</span>),<span>array</span>(<span>7</span>,<span>8</span>,<span>9</span>));</code>
Special case: application of list
I have never seen this usage in other languages.
list(variable 1, variable 2, variable 3)=array(1,2,3);
This is equivalent to assigning values to three variables separately.
Generate an array, filled with predefined values
I don't think this thing is very necessary, because the for loop will not be more complicated than it.
<code><span>$die</span>=range(<span>0</span>,<span>6</span>); <span>$even</span>=range(<span>0</span>,<span>20</span>,<span>2</span>); <span>$letters</span>=range(<span>"A"</span>,<span>"F"</span>);</code>
Test Array
Is it an array?
<code>bool is_array(<span>$state</span>);</code>
Print array
In addition to the for loop, there is a more convenient way to locate array elements
<code>boolean print_r(<span>$state</span>);</code>Copyright statement: This article is an original article by the blogger. Please indicate the source when reprinting.
The above introduces the PHP learning notes , including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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