Master PHP’s str_replace: Simple Replacements, Bulk Swaps, and Deletions

In PHP, strings are common data types, and the built‑in str_replace function provides a straightforward way to replace or remove characters within a string.

Function Syntax

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

The function searches the $subject string for $search and replaces each occurrence with $replace.

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 Words

$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 Characters

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

Output: Hell, wrld! Beyond these basic usages, str_replace also supports limiting the number of replacements and case‑sensitive operations; further details are available in the official PHP documentation.

Overall, mastering str_replace enables efficient string manipulation, improving code readability and performance in PHP applications.