Is php strstr() case insensitive?

No, php strstr() is case-sensitive. strstr() is used to perform string search in a case-sensitive manner, searching whether the specified string exists in another string; if it exists, the string and the remaining part are returned, otherwise FALSE is returned.

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

strstr() function searches for a string in another Whether it exists in the string, if so, return the string and the remaining part, otherwise return FALSE.

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

Syntax:

strstr(string,search,before_search)

Parameters	Description
string	Required. Specifies the string to be searched for.
search	Required. Specifies the string to search for. If the argument is a number, searches for characters that match the ASCII value for that number.
before_search	Optional. A Boolean value with a default value of "false". If set to "true", it will return the portion of the string preceding the first occurrence of the search parameter.

Return value: Returns the remaining part of the string (from the matching point). Returns FALSE if the searched string is not found.

Example:

<?php
echo strstr("Hello world!","llo");
?>

Output

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