➤ The strpos() function finds the position of the first occurrence of a string inside another string. Syntax:

strpos(string,find,start) 
// start is optional. Specifies where to begin the search. 

For instance:

// Find the position of the first occurrence of "lo" inside the string:
$string = "Hello world";
$result_string = strpos ($string,"lo");
echo $result_string;
//  outputs :  3

➤ strrpos() - Finds the position of the last occurrence of a string inside another string (c-sensitive) ➤ stripos() - Finds the position of the first occurrence of a string inside another string (c-insensitive) ➤ strripos() - Finds the position of the last occurrence of a string inside another string (c-insensitive)