How to replace a substring in a string in PHP?

@raphael_tillman 

In PHP, you can replace a substring within a string using the str_replace() function. Here's how to use it:

1
2
3
4
5
6

$string = "The quick brown fox jumps over the lazy dog";
$substring = "brown";
$replacement = "red";

$new_string = str_replace($substring, $replacement, $string);
echo $new_string; // Output: "The quick red fox jumps over the lazy dog"

In the example above, the str_replace() function takes three arguments:

1. The substring you want to replace ($substring)
2. The replacement string ($replacement)
3. The original string you want to make the replacement in ($string)

The function returns a new string with the substring replaced by the replacement string. You can assign the result to a new variable ($new_string in the example) or replace the original string directly.

You can also use str_replace() to replace multiple substrings at once by passing arrays of substrings and replacements. For example:

1
2
3
4
5
6

$string = "The quick brown fox jumps over the lazy dog";
$substr_arr = array("quick", "brown", "lazy");
$replace_arr = array("slow", "red", "energetic");

$new_string = str_replace($substr_arr, $replace_arr, $string);
echo $new_string; // Output: "The slow red fox jumps over the energetic dog"

In this example, str_replace() replaces all occurrences of each substring in the $substr_arr array with the corresponding replacement string in the $replace_arr array.