In that case, you can simply use the stripos() function in PHP. Sometimes, you might need to make this check of a substring in a string case-insensitive.

Therefore, always make sure that you evaluate the value of strpos() with != because there is no way to know where a substring might occur when dealing with strings in real life. On the other hand, Amy is right at the beginning, and its position of 0 evaluates to false, even though it exists in the string. Using a regular equality check will give you false negatives if the substring is right at the beginning of the main string.ДЄs you can see in the above example, Angela is not at the beginning of our sentence, so it would have a non-zero position which evaluates to true. This is because the position returned by strpos() starts with 0, and 0 can also equate to false. When you use strpos() to check for a substring, make sure that you use the strict inequality operator. The function will return false if it cannot find the substring. You can use the PHP strpos() function to get the position of the first occurrence of a substring in a string. People who need extra information about the match should consider using the functions below. These functions are ideal if you don't want to get any extra information about the substrings, like their position.

You can also perform a case-insensitive match with them by first converting both the string and substring to the same case using strtolower() or strtoupper().

str_starts_with() checks if a string starts with a specific substring.ДЄs I mentioned earlier, these functions perform a case-sensitive match.

str_ends_with() checks if a string ends with a specific substring.

str_contains() checks if a string contains a specific substring.

Please keep in mind that all these functions are case sensitive, and checking for the existence of an empty substring with them will always return true. Three new functions have been added in PHP 8 to help us figure out if a string contains another substring.

Php substr