The array is used in the string replace method as search string or needle: This is how the array was created and used in the function: You may do it by using another array in the replacement_string as shown in the example below. First, have a look at the str_replace syntax and examples below. Definition and Usage. PHP str_replace Function is an inbuilt function in PHP. I have a query with a loop that has a lot of keywords that need to be linked to other sites. If search and replace are arrays, then str_replace() takes a value from each array and uses them to search and replace on subject.If replace has fewer values than search, then an empty string is used for the rest of replacement values.If search is an array and replace is a string, then this replacement string is used for every value of search. Now we have successfully replaced three items using the PHP str_replace() function. This function can handle four arguments : the item(s) to look for, the item(s) used for replacing words, the container (the sentence in … In str_replace function, an HTML tag is added with background color in