Strings Php

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  4. By supplying no start or length arguments, the string will be added to the beginning
  $mystring = substr_replace("Hello World", "H3110 W0r1d!", 0, 0);
  echo $mystring . ""; //Echos H3110 W0r1d!Hello World
  
  $mystring = substr_replace("Hello World", "0 w0", 4, 4);
  echo $mystring; //Echos Hell0 w0rld.
  
?>