substr_replace « String « PHP

1.By supplying no start or length arguments, the string will be added to the beginning
2.PHP has two main functions for performing simple search-and-replace operations. The first one is substr_replace
3.Replacing Substrings: string substr_replace ( string str, string replacmnt, int start [, int len] )
4.Replacing a Portion of a String Using substr_replace()
5.Replacing a substring with substr_replace()
6.substr_replace() function replaces the string with replacement.