Using PHP str_replace for String Replacement and Deletion

In PHP, strings are common data types, and the str_replace function provides a simple way to replace or delete characters within a string.

Syntax: str_replace($search, $replace, $subject);

Example 1 – Simple replacement:

$text = "今天是星期一，明天是星期二，后天是星期三。";
$new_text = str_replace("星期一", "周一", $text);
echo $new_text;

Output: 今天是周一，明天是星期二，后天是星期三。

Example 2 – Replacing multiple characters using an array:

$text = "The quick brown fox jumps over the lazy dog.";
$new_text = str_replace(array("quick", "brown", "lazy"), "slow", $text);
echo $new_text;

Output: The slow fox jumps over the slow dog.

Example 3 – Deleting a specific character:

$text = "Hello, world!";
$new_text = str_replace("o", "", $text);
echo $new_text;

Output: Hell, wrld!

The function also supports additional options such as limiting the number of replacements or case‑sensitive matching, which are documented in the official PHP manual.

In summary, str_replace is a versatile string manipulation tool that helps developers efficiently perform replacements or deletions, improving code readability and performance.