


10 PHP programming habits to help you find a job, 10 PHP programming habits to find a job_PHP tutorial
10 PHP programming habits to help you find a job, 10 PHP programming habits to find a job
The past few weeks have been a quite complicated experience for me. Our company had a major layoff, and I was one of them, but I experienced the joy of it. I've never been fired, so it's hard not to overthink it. I started browsing job boards, and a position for a full-time PHP programmer appealed to me, so I sent in my resume and got an interview. Between interviews, I chatted with its main programmers on the consultation phone, and finally they gave me a set of test questions, one of which was very intriguing.
Find the error in the following code:
$x = new Array();
$x[sales] = 60;
$x[profit] = 20:
foreach($x as $key = $value) {
echo $key " " $value "
";
}
}
How many can you find?
If you find that there is a missing comma in the function parameter list, "new Array()" is incorrect, a colon is used at the end of the line instead of a semicolon, "=>" is not used in foreach and " " is used to connect characters String, congratulations, you found all the errors and you have mastered the basics of PHP programming.
Now let me tell you how I answered this question. I certainly identified the above issues, but I went one step further. For example, have you ever noticed that a string in an array index is not enclosed in quotes? Although this is not a serious error, it is a coding error. Also, did you notice that in the echo line it uses double quotes instead of single quotes? It uses the abbreviated form of the PHP start flag? And it doesn't use "
"" instead of "
"?
After finding the actual error, I added a comment after the problem found above. This was enough to change the answer sheet from "correct" to "thought-provoking", which also added a lot of points to my application, so they decided to hire me. (But in the end I refused because I like the tight pace of life and dedicate my PHP skills to my customers, rather than a company involved in the telecommunications market. I need a stage to show off my skills.)
Then let’s take a look at the 10 PHP programming habits I wrote:
1. String enclosed in single quotes
When double quotes are used to enclose a string, the PHP interpreter will perform variable substitution, escaping and other operations on it, such as " ". If you just want to output a basic string, use single quotes, which will save some resources. Of course, if you need to perform variable substitution, you must use double quotes, but in other cases, use single quotes.
2. Output of string
Which of the following statements do you think runs the fastest?
print "Hi my name is $a. I am $b";
echo "Hi my name is $a. I am $b";
echo "Hi my name is ".$a.". I am ".$b;
echo "Hi my name is ",$a,". I am ",$b;
echo 'Hi my name is ',$a,'. I am ',$b;
Maybe this seems strange, but the last one actually runs the fastest. Print is slower than echo, it is slower when replacing variables in a string, and concatenating strings is slower than concatenating with commas. The last sentence is the embodiment of the first habit. So, not doing variable substitutions in strings will not only make your program run faster, it will also make your code more understandable in any editor with syntax highlighting (variables will be highlighted). Few people know that echo parameters can be concatenated with commas, and the speed is faster than string concatenation. Finally, if you use the first habit, this statement will be very good.
3. Use single quotes
in array indexAs you can see in the test question above, I pointed out that $x[sales] is technically wrong and the index should be bracketed, i.e. $x['sales']. This is because PHP recognizes an unquoted index as a "naked" string and interprets it as a constant. When the definition of the constant cannot be found, it is interpreted as a string, so this statement is runnable. Enclosing the index can save this part of the work, and there will be no errors if you happen to use this string to define a constant in the future. I've even heard that doing this makes it about seven times faster, although I haven't tested it myself. For more discussion on this topic, see the section "What Arrays Can and Can't Do" in the "Arrays" chapter of the PHP manual.
4. Do not use the abbreviation of the start mark
Are you using such a symbol? "
5. Try not to use regular expressions
When performing regular string operations, try not to use regular expressions (preg and ereg series functions) as much as possible. The str_replace function is much faster than preg_replace, and even the strtr function is faster than str_replace. Save yourself the trouble and your boss will thank you.
6. Do not use functions in loop declarations
This problem does not only appear in PHP, you can often see it in code in other languages:
Difference: for($i=0;$i
Good: $count=count($array);for($i=0;$i
This should be easy to explain, but many people just want to write less lines of code and waste system resources. If the count function is used in the loop declaration, it will be called once for each loop. If you have a lot of loops, it will waste a lot of time.
7. Never use register_globals and magic quotes
These are two very old functions. They may have been a good method at the time (ten years ago), but it seems not to be the case now. Older versions of PHP will turn on these two functions by default when installed, which can cause security holes, programming errors and other problems. For example, variables will only be created when the user enters data. Both features are now deprecated and should be avoided by every programmer. If your past programs have used these two functions, remove them as soon as possible.
8. Be sure to initialize the variables ("initialization" here refers to "declaration" - translator's note)
When an uninitialized variable is required, the PHP interpreter will automatically create a variable, but it is not a good idea to rely on this feature for programming. This can make the program crude or confusing because you need to figure out where the variable was created. Additionally, incrementing an uninitialized variable is slower than an initialized variable. So it would be a good idea to initialize variables.
9. Comment the code
This question has been raised many times, but no amount of times is enough. I know some places won't hire programmers who don't comment their code. After a previous job interview, I went through the code I wrote with the vice president and interviewer. When they were impressed by the code comments I made, they also learned about this habit of mine. One day later, I got the job.
I know some people who call themselves PHP masters claim that their code is well written and does not require any comments. In my opinion, these people are trash. It is worthwhile to learn the specifications and techniques for writing comments and become familiar with comment assistance software such as phpDocumentor or Doxygen.
10. Follow a programming specification
On this note, what you need to ask your potential boss during the interview is what programming conventions they are using. PEAR?Zend?Internal Standards? Mention the programming standard you are using, whether it is one of your own creation or one that is currently popular. For a loose language like PHP, if there is no good programming specification, then the code will look like a bunch of garbage. Stinky, disgusting garbage. Some basic specifications include space specifications, bracket matching, naming style, etc. This is a must for anyone who pursues high-quality code.
Someone said: "I hate your 4-space indentation." I'm going to say, what? Use 4 spaces for indentation? This takes up 3 characters more space than using tabs. More importantly, you can customize the tab indentation value as long as you use an editor more advanced than Notepad. So every programmer can look at the code in the way they're most comfortable with. Set to 4 when possible, or 0 if you're a masochist. I don’t care anyway, but you just can’t use spaces for indentation!
In general, I hope the above programming habits can be helpful to you. If you want to make a good impression during an interview, all it takes is a few small details.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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.


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