In PHP, we can use the function mb_substr_count() to count the total number of substrings in a given string.
In PHP, the iconv_strpos() function is used to read the first character from a given string. It finds the position of the first occurrence of a character in a string. It is an inbuilt function in PHP.
In this tutorial, this function performs a case-sensitive search and checks if a string ends with a substring in PHP.