How does php count the number of character occurrences

Today, I will talk to you about php how to count the number of characters, many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Description

1. Omit the parameters $start and $length.

2. $start: used to specify where to start searching for substrings in a string. $length: used to specify the length of the search.

Depending on the values set by the parameters $start and $length, the substr_count () function returns different values.

Example

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