PHP Basics - Watson Blog

Write (new class()) ->func() in PHP

I am a novice, please skip the old bird! The first time I saw this writing method of "(new class()) ->func()" today, I can probably guess what it means, but I'm not sure. Baidu didn't find the answer, and finally I got the answer in a php communication group. Its (ne

June 27 1,099 one

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[PHP Example] Several methods to implement the multiplication table (three loops, four angles, and one recursion)

Implementing the multiplication table in PHP is a practical problem encountered in the interview. Today, I will summarize it. It's nothing for a veteran. It's easy. But for a novice like me, writing in different ways is quite a training of logical thinking? php &...

December 14th nine hundred and eighty-one comment

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Character encoding notes: detailed interpretation of ASCII, Unicode and UTF-8

The character coding has always been a bit confusing. This time, we did an interview question of "php statistics of the number of Chinese characters in Chinese and English strings". We needed to use this related knowledge, so we decided to make it clear. Character coding is the cornerstone of computer technology. If you want to use computers skillfully, you must know a little about character coding

December 7 one hundred and seventy-five comment

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An interview question about php assignment, value transfer by reference and unset

Recently, there have been many interviews, basically one interview a day. Encountered a problem about php assignment and value transfer, reference value transfer and unset, which had not been studied in depth before. Baidu found that there are still many Taoists. Interview question: What is the output of the following? Class User ...

December 6 two hundred and twenty-five comment

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[PHP Instance] Detailed introduction to modifying the lifetime of SESSION

[PHP Example] Modify the detailed introduction of SESSION's life time. This problem is often encountered in interviews. Since the blogger has been frequently interviewed for a job recently, this problem will be sorted out and recorded. To modify the lifetime of SESSION, let's manually set the session

December 5 one hundred and thirty-eight comment

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Summary of methods for converting PHP two-dimensional array (or arbitrary dimensional array) into one-dimensional array

In the process of PHP development, there are many array application scenarios. For example, PHP two-dimensional arrays (or arbitrary dimensional arrays) are converted into one-dimensional arrays. Today's article summarizes the method of converting PHP two-dimensional arrays (or arbitrary dimensional arrays) into one-dimensional arrays. Suppose there is a two-dimensional array: $use

November 19th nine hundred and seventy comment

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Several methods for PHP to extract the value of a column of a two-dimensional array and convert it into a one-dimensional array

The extraction of a column of a two-dimensional array is a very common and frequently used function in PHP. Because of this, PHP has added a special function array_column() after 5.5.0. Of course, if your PHP version is lower than 5.5.0, you have to use

November 18th three hundred and fifty-two comment

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Performance comparison test between array_push and $arr []=$value in PHP

In the Gaomeng blog, I saw "the performance comparison test between array_push and $arr []=$value in php". This problem is really not noticed during normal use. After seeing this article again, I also tried it. The results are as follows. Compare array_push with $

November 15th three hundred and eleven comment

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How to use PHP Closure function() use() {}

I was stunned when I saw the "function() use() {}" function today. It's the first time I saw this usage (I'm a novice: arrow:). I found the answer in segmentfault. It turns out that this is a use of PHP 5.3 to introduce closures, us

November 7 3,015 comment

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