PHP程序替换字符串中的单词

冷不防 2023-03-05 15:48 12阅读 0赞

What if a user has typed his name wrong and now he wants to replace his name with the correct name? This a practical scenario, and PHP even has an inbuilt function to do so. There are the following methods to rectify an error made in the string.

如果用户输入了错误的姓名，现在又想用正确的姓名替换姓名，该怎么办？ 这是一个实际的场景，PHP甚至具有内置功能。 有以下方法可纠正字符串中的错误。

### 1)使用*str\_replace()*函数 **(**1) Using *str\_replace()* function**)** ###

In this method, *str\_replace()* function replaces all the occurrences of the *replaceString* by the mentioned string.

在此方法中， *str\_replace()*函数将所有出现的*replaceString*替换为上述字符串。

The function *str\_replace()* is used for searching a regular expression and replacing a specific content in place of all the occurrences of searched expression. It always returns either a *string* or an *array*, according to what was searched and replaced. It has 3 compulsory parameters while one is optional. The compulsory parameters of the function are - value to be searched, the value it will be replaced with and the string in which this value needs to be searched. The optional parameter specifies the count of the number of times the replacement is needed.

函数*str\_replace()*用于搜索正则表达式并替换特定内容来代替所有出现的搜索表达式。 它始终根据搜索和替换的内容返回*字符串*或*数组* 。 它具有3个必选参数，而1个是可选参数。 该功能的强制性参数是-要搜索的值，将替换为的值以及需要在其中搜索该值的字符串。 可选参数指定需要更换的次数。

**Syntax:**

**句法：**

str_replace (
        $word_to_replace, 
        $new_word, 
        $string_in_which_word_is_present
        );

**Program:**

**程序：**

<?php
        $str= 'Sayesaha';
        
        // message to be printed
        $newstr = 'welcome '. $str . ' to learn about PHP language. We are delighted to have you '.$str;
        
        // printing message 
        echo ($newstr."\n");
        
        // changing the name
        $str1= 'Sayesha';
        echo str_replace($str, $str1 , $newstr);
    ?>

**Output:**

**输出：**

welcome Sayesaha to learn about PHP language. We are delighted to have you Sayesaha
    welcome Sayesha to learn about PHP language. We are delighted to have you Sayesha

### 2)使用*str\_ireplace()*函数 **(**2) Using *str\_ireplace()* function**)** ###

This function does the same thing as *str\_replace()*, i.e. the function *str\_ireplace()* is used for searching a regular expression and replacing a specific content in place of all the occurrences of searched expression, the difference being that *str\_ireplace()* is case insensitive. It is also an inbuilt function of PHP.

此函数与*str\_replace()*的功能相同，即，函数*str\_ireplace()*用于搜索正则表达式并替换特定内容来代替所有出现的搜索表达式，区别在于*str\_ireplace()*不区分大小写。 它也是PHP的内置函数。

**Program:**

**程序：**

<?php
        $str = 'sayesha';
        
        // message to be printed
        $newstr = 'welcome ' . $str . ' to learn about PHP language. We are delighted to have you ' . $str;
        
        // printing message
        echo ($newstr . "\n");
        
        // changing the name
        $str1 = 'Sayesha';
        echo str_ireplace($str, $str1, $newstr);
    ?>

**Output:**

**输出：**

welcome sayesha to learn about PHP language. We are delighted to have you sayesha
    welcome Sayesha to learn about PHP language. We are delighted to have you Sayesha

### 3)使用搜索和替换( *preg\_replace()*函数) **(**3) Using Search and Replace (*preg\_replace()* function)**)** ###

What if you need to search a word and then replace it. For example, there was an error while typing an article, and the word 'school' needs to be replaced with the word 'college'.

如果您需要搜索一个单词然后替换它，该怎么办。 例如，键入文章时发生错误，需要将“学校”一词替换为“学院”一词。

**Syntax:**

**句法：**

preg_replace(
        $word_to_replace, 
        $new_word, 
        $string_to_be_searched, 
        $limit, 
        $count
        );

*preg\_replace()* function is used in PHP for searching a regular expression and replacing a specific content in place of the searched expression. It always returns either a string or an array, according to what was searched and replaced.

在PHP中， *preg\_replace()*函数用于搜索正则表达式并替换搜索到的表达式的特定内容。 它始终根据搜索和替换的内容返回字符串或数组。

**Program:**

**程序：**

<?php
        // string
        $str = 'We welcome all of you to our school of PHP.
                    This school is one of its kind.
                    Many schools dont offer this subject.';
        $s = 'school';
        $newstr = 'college';
        
        // printing message
        echo ('Old message-->' . $str);
        echo ("\n");
        echo ('New message-->');
        
        // Using preg_replace() function
        // to replace the word
        $str = preg_replace('/school/', $newstr, $str);
        
        // Printing the result
        echo $str;
    ?>

**Output:**

**输出：**

Old message-->We welcome all of you to our school of PHP.
                    This school is one of its kind.
                    Many schools dont offer this subject.
    New message-->We welcome all of you to our college of PHP.
                    This college is one of its kind.
                    Many colleges dont offer this subject.

> 翻译自: [https://www.includehelp.com/php/program-to-replace-a-word-in-a-string.aspx][https_www.includehelp.com_php_program-to-replace-a-word-in-a-string.aspx]

[https_www.includehelp.com_php_program-to-replace-a-word-in-a-string.aspx]: https://www.includehelp.com/php/program-to-replace-a-word-in-a-string.aspx