mixed str_replace ( mixed needle, mixed replace, mixed haystack [, int &count] )

 
<?
    $string = "this is a test";
    $newstring = str_replace("is", "is not", $string);
    print $newstring;
?>

1.	Replacing Substrings Using str_replace()
2.	str_replace demo
3.	str_replace() accepts arrays for all its arguments
4.	str_replace() function searches for occurrence in string, replacing all instances with replacement.
5.	str_replace.php
6.	Using str_replace()
7.	Replacing Tabs with Spaces
8.	case-sensitive?
9.	Using template file
10.	Switching tabs and spaces

mixed str_replace ( mixed needle, mixed replace, mixed haystack [, int &count] ) : str_replace « String « PHP