How to implement replacement position in php

php method to implement replacement position: 1. Create a php sample file; 2. Use the strpos function to find whether a string contains a certain phrase; 3. Use the substr_replace function to achieve replacement.

The operating environment of this tutorial: Windows 10 system, PHP version 8.1, Dell G3 computer.

php How to achieve replacement position?

Find and replace Chinese strings in PHP

Find whether a string contains a certain phrase

<?php
echo strpos("一二三四五","一");
echo "<br>";
echo strpos("一二三四五","二");
?>

The printed result is:

0

3

The following is the code to replace a certain word:

<?php
$word = "一二三四五";
$reWord = "六六六";
$pos = strpos("一二三四五","三");
$newWord = substr_replace($word, $reWord, $pos, 3);//从上面的例子中可以看出中文是占3个字符，所以最后一个参数为3
                                                      //要想得到（一二六六六 ）的结果，就相当于替换掉后面的3个中文，可以把最后一个参数改为3*3即9
                                                    //如果最后一个参数为0就可以实现在制定下标上插入新字符串
echo "$newWord";
?>

The output result is:

一二六六六四五

Use string replacement to filter text

<?php
$words = ["我", "你", "他", "她"];//过滤库
$sentence = "我和你一起去他家找她";//待过滤的句子
foreach($words as $word)//遍历过滤库的词
{
$len = strlen($word);//获取过滤词的长度
$pos = strpos($sentence,$word);//寻找过滤词的位置
$sentence = substr_replace($sentence,&#39;&#39;, $pos, $len); 
}
echo $sentence;
?>

The filtered result is:

和一起去家找

Recommended learning: "PHP Video Tutorial"

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