PHP's four functions for finding strings in strings (strstr(), strchr(), strrchr(), stristr())

To find another string in a string you can use strstr(),strchr(),strrchr(),stristr() Any one of the four functions.

The function strstr() is the most common. The function prototype is:

strstr(string,search,before_search);
//string要被搜索的字符串，search所搜索的字符串，before_search默认值为 "false" 的布尔值，如果设置为 "true"，它将返回 search 参数第一次出现之前的字符串部分。

Example:

echo strstr("I love Shanghai","love");//返回值为“love Shanghai”

The function strchr() is exactly the same as the function strstr();

The function stristr() is almost the same as the function strstr(). The difference between them is that the target keyword string of strstr() is case-sensitive, while the target keyword string of stristr() is not case-sensitive;

The function strrchr() is almost the same as the function strstr(), but strrchr() will return the searched string from before the last occurrence of the target keyword.

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