How to replace text in PHP? Summary of built-in functions

PHP is a popular programming language that has been widely used in web development. One of the common tasks is to replace text, which can be used for many purposes such as text processing, data cleaning, data transformation, etc. In this article, we will explain how to replace text in PHP.

Function to replace text

We can use many functions built into PHP to replace text. Here are some commonly used functions.

1.str_replace

The str_replace function can find the specified value in a string and replace it with a new value. It can be used to replace a single character, a string, or multiple values ​​in an array. Here is an example:

$str = "I love PHP";
$new_str = str_replace("PHP", "Java", $str);
echo $new_str; //输出：I love Java

2.str_ireplace

The str_ireplace function is similar to the str_replace function, except that it is case-insensitive. Here is an example:

$str = "I love PHP";
$new_str = str_ireplace("php", "Java", $str);
echo $new_str; //输出：I love Java

3.preg_replace

The preg_replace function can replace regular expressions. It is similar to the str_replace function, except that it can perform more complex pattern matching and replacement, and supports regular expression replacement. The following is an example:

$str = "Hello, world!";
$new_str = preg_replace("/\bworld\b/i", "PHP", $str);
echo $new_str; //输出：Hello, PHP!

4.strtr

The strtr function can replace multiple substrings in a string and can replace multiple characters. The following is an example:

$str = "ABC DEF GHI";
$replace = array("A" => "1", "B" => "2", "C" => "3",
                 "D" => "4", "E" => "5", "F" => "6",
                 "G" => "7", "H" => "8", "I" => "9");
$new_str = strtr($str, $replace);
echo $new_str; //输出：123 456 789

Here we create a $replace array with A,B,C,D,E,F,G,H,I as keys and 1,2,3,4 ,5,6,7,8,9 as values. Then use the $str string and $replace array to call the strtr function to get a new string.

Summary

Replacing text is a common task, and PHP provides a wealth of functions to achieve this task. By understanding and mastering these functions, we can process text more conveniently and improve work efficiency. At the same time, we can also use PHP to perform more complex pattern matching and replacement to meet various needs.

The above is the detailed content of How to replace text in PHP? Summary of built-in functions. For more information, please follow other related articles on the PHP Chinese website!