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How does php look for strings that appear several times

2025-01-17 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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Editor to share with you php how to find strings appear several times, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

Search method: 1, use substr_count (), syntax "substr_count (string,substring)"; 2, use mb_substr_count (), syntax "mb_substr_count (string,substring)".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Method 1: use the substr_count () function

The substr_count () function calculates the number of times the substring appears in the string (case-sensitive).

Syntax:

Substr_count (string,substring,start,length)

String is required. Specifies the string to be checked.

Substring is required. Specifies the string to search for.

Start is optional. Specifies where to start the search in the string.

Length is optional. Specify the length of the search.

Note: if the start parameter plus the length parameter is greater than the string length, this function generates a warning.

Example:

Output result:

Method 2: use the mb_substr_count () function

The mb_substr_count () function counts the number of occurrences of strings.

Syntax:

Mb_substr_count (string,substring,encoding)

String is required. Specifies the string to be checked.

Substring is required. Specifies the string to search for.

Encoding is optional. Specifies the character encoding. If omitted or null, internal character encoding is used.

The above is all the contents of the article "how to find strings that appear several times in php". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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