Introduction to PHP method of replacing some characters in a string_PHP Tutorial

WBOY
Release: 2016-07-13 10:48:15
Original
900 people have browsed it

We will all use the str_replace function to replace strings in php. This function can also use regular expressions. The following editor will introduce to you an example of replacing some characters in a string or replacing the first appearing character.

Now there is a requirement: string A and string B. String B contains string A. Use string A to replace A in string B with other strings or delete it.

Using PHP functions, str_ireplace() and str_replace() can do this.

1. The str_ireplace(find,replace,string,count) function uses a string to replace other characters in the string (this function is not case-sensitive).

For example:

The code is as follows Copy code
 代码如下 复制代码

header(“Content-Type: text/html; charset=utf-8"); // 防止中文乱码
$str_1 = '郭g碗w瓢p盆p';
$str_2 = '?潘?';
$str_3 = 'PHP 替换字符串中的一些字符串-郭G碗w瓢p盆P';

$str = str_ireplace($str_1,$str_2,$str_3);
echo $str;
// 输出:PHP 替换字符串中的一些字符串-?潘
?>

header("Content-Type: text/html; charset=utf-8"); // Prevent Chinese garbled characters

$str_1 = 'Guo g bowl w ladle p basin p';

$str_2 = '?Pan?';
$str_3 = 'PHP replace some strings in the string-Guo G bowl w ladle p basin P';

                                                                                   $str = str_ireplace($str_1,$str_2,$str_3);
代码如下 复制代码

header(“Content-Type: text/html; charset=utf-8"); // 防止中文乱码
$str_1_s = '郭g碗w瓢p盆p';
$str_1_b = '郭G碗w瓢p盆P';
$str_2 = '?潘?';
$str_3 = 'PHP 替换字符串中的一些字符串-郭G碗w瓢p盆P';

$str_s = str_replace($str_1_s,$str_2,$str_3).'

';
    $str_b = str_replace($str_1_b,$str_2,$str_3);
    echo $str_s; // 无法查找到,输出原字符串
    echo $str_b; // 被正确替换
    // $str_s 输出:PHP 替换字符串中的一些字符串-郭G碗w瓢p盆P
    // $str_b 输出:PHP 替换字符串中的一些字符串-?潘
?>

echo $str;

// Output: PHP replaces some strings in the string -?Pan

?>


2. The str_replace(find,replace,string,count) function uses a string to replace other characters in the string (this function is case-sensitive).

(Parameters and descriptions are the same as str_ireplace() function)

The code is as follows Copy code
 代码如下 复制代码

$str=preg_replace('/abc/','xyz',$str,1);
echo $str;

header("Content-Type: text/html; charset=utf-8"); // Prevent Chinese garbled characters $str_1_s = 'Guo g bowl w ladle p basin p'; $str_1_b = 'Guo G bowl w ladle p basin P'; $str_2 = '?Pan?'; $str_3 = 'PHP replace some strings in the string-Guo G bowl w ladle p basin P';                                                                       $str_s = str_replace($str_1_s,$str_2,$str_3).'

'; $str_b = str_replace($str_1_b,$str_2,$str_3); echo $str_s; // Unable to find, output the original string echo $str_b; // Correctly replaced // $str_s output: PHP replaces some strings in the string - Guo G bowl w ladle p basin P // $str_b output: PHP replaces some strings in the string -?Pan ?>
If you want to replace the above, you must replace all the characters. What if I want to replace only the characters that appear for the first time? Many people have thought of using the str_replace() function to see if the use of this function is what we want str_replace( mixed $search , mixed $replace , mixed $subject [, int &$count ] ) I accidentally thought that was what we wanted. The last parameter is to return the total number of replacements. It is a reference variable, not what I want to specify how many times it will be replaced, so use str_replace( ) is not possible preg_replace() can be implemented, but it’s a pity that regular expressions are used,
The code is as follows Copy code
$str=preg_replace('/abc/','xyz',$str,1); echo $str;

Is there any way to use regular expressions? Yes, it can be like this

The code is as follows
 代码如下 复制代码

$replace='xyz';
if(($position=strpos($str,$replace))!==false){
     $leng=strlen($replace);
    $str=substr_replace($str,'xyz',$position,$leng);
}
echo $str;

Copy code
$replace='xyz';
if(($position=strpos($str,$replace))!==false){
$leng=strlen($replace);
$str=substr_replace($str,'xyz',$position,$leng);
}
echo $str;

http://www.bkjia.com/PHPjc/632792.htmlwww.bkjia.comtrue
http: //www.bkjia.com/PHPjc/632792.html
TechArticle
We will all use the str_replace function to replace strings in php. This function can also use regular expressions. The editor below Let me introduce to you how to replace some characters in a string or replace the first...
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template