string replace php

1<?php
2//str_replace("Original Value", "Value to be replaced", "String");
3$result = str_replace("1", "2", "This is number 1");
4// Output: This is number 2
5?>

1str_replace ($search, $replace, $subject);

1$var1 = 'hello.world';
2$var2 = str_replace(".", "-", $var1);
3echo $var2; // hello-world
4

1$new_string = str_replace( $take_out, $put_in, $string);

1echo str_replace("worss","world","Hello worss in PHP!!");

1#Definition:
2str_replace ( array|string $needle , array|string $needle_replacement , string|array $haystack , int &$output_count = null ) : string|array
3str_replace ($needle, $needle_replacement, $haystack, $output_count);
4  // $needle --> the string value or array of string values you're looking for
5  // $needle_replacement --> the string value or array of string values you'll replace the needle(s) with
6  // $haysytack --> the string or array of strings you'd like to search/replace needles in
7  // $output_count --> not an input, but can be used to get an aggregator to count how many needles were replaced
8
9#Simple Example:
10echo str_replace("_", " ", "Hello_World_of_PHP");
11  // Prints: "Hello World of PHP"
12
13#Complex Example:  
14$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
15/*OR*/ $vowels = ["a", "e", "i", "o", "u", "A", "E", "I", "O", "U"];
16echo str_replace($vowels, "", "Hello World of PHP", $count);
17  // Prints: "Hll Wrld f PHP"
18echo $count
19  // Prints: "4"
20
21#This function is case-sensitive. 
22  #Use str_ireplace() for case-insensitive replace.