How to replace text content in PHP?

In PHP, you can replace text content using the str_replace function, which takes three parameters: the content to be replaced, the content to replace it with, and the string in which the replacement should be performed.

The sample code is as follows:

<?php
$text = "Hello World";
$newText = str_replace("World", "PHP", $text);
echo $newText; // 输出：Hello PHP
?>

In the above example, the str_replace function replaces “World” in the string with “PHP”, assigns the replaced result to the $newText variable, and finally outputs the replaced content using echo.

In addition to the str_replace function, you can also use regular expressions to replace text content. This can be done using the preg_replace function, which also accepts three parameters: the regex pattern to match, the replacement content, and the string to perform the replacement on.

Here is the sample code:

<?php
$text = "Hello World";
$newText = preg_replace("/World/", "PHP", $text);
echo $newText; // 输出：Hello PHP
?>

In the example above, the preg_replace function is used with the regular expression /World/ to match the string “World” and replace it with “PHP”, before finally echoing out the replaced content.

It should be noted that the regular expressions in the preg_replace function can be more flexibly matched to the content that needs to be replaced, and can be adjusted according to actual needs.