Function Description
substr_count() Counts the number of substring occurrences
strstr() Finds the first occurrence of a string
strchr() Can be used as an alias of strstr()
strrchr() Finds the last occurrence of a character in a string
stristr() Performs the same functionality as strstr() but is case-insensitive
substr_replace() Replaces text within a portion of a string
strops() Finds the position of the first occurrence of a string
substr() Returns a piece of a string