Output: 0 Code language: PHP ( php ) PHP stripos() function To avoid this issue, you should always compare the result of the strpos() function with true or false using the = or != operator. So you see the 'not found' message in the output. The string 'To' locates at the beginning of the string therefore, the strpos() function returns 0. Output: Not found Code language: PHP ( php ) The following example uses the strpos() function to search for the substring 'To' in the string 'To do or not to do': 3 Code language: PHP ( php ) 2) Using PHP strpos() function to search for a substring with an offset example The following example uses the strpos() function to search for the substring 'to' in the string 'To do or not to do': 
If $offset is positive, the strpos() function starts the search at $offset number of characters to the end of the string. The $offset is an integer that represents the index at which the strpos() function starts the search.The $needle is a string value to search for.The $haystack is a string to search in.The strpos() function has the following parameters:
Here’s the syntax of the strpos() function: strpos ( string $haystack, string $needle, int $offset = 0 ) : int| false Code language: PHP ( php ) The PHP strpos() function returns the index of the first occurrence of a substring within a string. Introduction to the PHP strpos() function
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Summary: in this tutorial, you’ll learn how to use the PHP strpos() function to get the index of the first occurrence of a substring in a string.
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