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

In PHP, strings are common data types, and sometimes you need to replace or delete certain characters. PHP provides the convenient str_replace function for this purpose.

Syntax

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

The function searches for $search in the string $subject and replaces it 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 characters

$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. This example uses an array as the search parameter to replace several words with a single replacement.

Example 3: Deleting specific characters

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

Output: Hell, wrld! Here the character “o” is replaced with an empty string, effectively deleting it.

The str_replace function also supports additional options such as limiting the number of replacements and case sensitivity; refer to the official PHP documentation for more details.

In summary, str_replace is a versatile string replacement function that can conveniently handle character replacement or removal tasks, improving code efficiency and readability.