PHP str-replace() Sample Code and Explanation

The str_replace() function is a built-in function in PHP that replaces all occurrences of a search string with a replacement string in a given string. It returns a new string with the replacements made.

Example 1: Replacing a Single Occurrence of a String

Here is an example of using str_replace() to replace a single occurrence of a string:

$string = 'Hello, World!';
$old_string = 'Hello';
$new_string = 'Hi';
$new_string = str_replace($old_string, $new_string, $string);

echo $new_string; // Output: Hi, World!

In this example, we use str_replace() to replace the first occurrence of the string Hello in the string Hello, World! with the string Hi. The resulting string is Hi, World!.

Example 2: Replacing Multiple Occurrences of a String

Here is an example of using str_replace() to replace multiple occurrences of a string:

$string = 'The quick brown fox jumps over the lazy dog.';
$old_string = 'o';
$new_string = '0';

$new_string = str_replace($old_string, $new_string, $string);

echo $new_string; // Output: The quick br0wn f0x jumps 0ver the lazy d0g.

In this example, we use str_replace() to replace all occurrences of the letter o in the string The quick brown fox jumps over the lazy dog. with the number 0. The resulting string is The quick br0wn f0x jumps 0ver the lazy d0g..

Example 3: Replacing Case-Insensitive

Here is an example of using str_replace() to replace a string case-insensitively:

$string = 'Hello, World!';
$old_string = 'hello';
$new_string = 'Hi';

$new_string = str_ireplace($old_string, $new_string, $string);

echo $new_string; // Output: Hi, World!

In this example, we use str_ireplace() instead of str_replace() to replace the string hello in the string Hello, World! with the string Hi, but in a case-insensitive way. The resulting string is Hi, World!.

Conclusion

The str_replace() function is a powerful tool for replacing occurrences of a search string with a replacement string in a given string in PHP. By using this function, you can easily manipulate strings to meet your needs, helping to improve the functionality and versatility of your PHP applications.