Summary of PHP string learning series (continuously updated~)

During this period, I have written a lot of series of articles on learning PHP string operations. I believe they will be helpful to everyone. The following article is intended to summarize all the related articles that have been written before and make a big summary to facilitate everyone's learning. You are welcome to collect, share and learn~

PHP String Learning Series Articles The summary is as follows:

1: "PHP string learning: comparing two strings"

2: "PHP string Learn how to calculate the length of English strings》

Three:《PHP string learning how to calculate the matching degree of two strings》

Four :《PHP string learning to determine whether a substring exists (case insensitive)》

5:《PHP string learning to detect whether a substring exists ( Case sensitive)》

Six:《PHP string learning how to return the length of Chinese characters or mixed characters》

Seven:《PHP String learning counts the number of occurrences of characters》

Eight:《PHP string learning reversely outputs all characters》

Nine:《PHP string learning: Divide the string into substrings of smaller length》

十：《PHP string learning: How to remove other characters, leaving only numbers》

Eleven: "PHP string learning uses regular filtering characters to return numeric characters"

Twelve:"PHP string learning conversion The size of one character (3 methods)》

Thirteen:《PHP string learning: How to know how many words are contained in the string》

The PHP string operation learning series articles that I have written so far are all here. I hope they are helpful to everyone. I will update them when there are new articles!

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