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This article will explain in detail about the case-insensitivity of strstr () in php. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

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

The strstr () function searches for the existence of a string in another string, and if so, returns the string and the rest, otherwise it returns FALSE.

The strstr () function is case sensitive. For a case-insensitive search, use the stristr () function.

Syntax:

The strstr (string,search,before_search) parameter is required to describe string. Specifies the string to be searched. Search is required. Specifies the string to search for. If the parameter is a number, search for characters that match the ASCII value corresponding to the number. Before_search is optional. A Boolean value with a default value of "false". If set to "true", it returns the part of the string before the first occurrence of the search parameter.

Return value: returns the rest of the string (from the match point). If the searched string is not found, FALSE is returned.

Example:

Output

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