How to replace matching string in php

php method to replace the matching string: 1. Use the "str_replace" function to replace the matching string; 2. Use the "substr_replace" function to replace the matching string.

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Find and replace php strings

Two major functions for string search and replacement

* 1.str_replace()
* 2.substr_replace()
 
 
$str = 'Peter Zhu is PHP lecture';
//二、str_replace()
//1.str_replace()
echo str_replace(&#39;php&#39;,&#39;JAVA&#39;,$str).&#39;<br>&#39;;
//2.删除指定字符:用空字符替换即可
echo str_replace(&#39;Zhu&#39;,&#39;&#39;,$str).&#39;<br>&#39;;
//3.要被替换的多个子字符串,可以存放到数组中
echo str_replace([&#39;Zhu&#39;,&#39;PHP&#39;],&#39;王楚&#39;,$str).&#39;<br>&#39;;
//4.新字符串也可以来自数组,但数量必须要被替换数组相同
echo str_replace([&#39;Zhu&#39;,&#39;PHP&#39;],[&#39;Wang&#39;,&#39;python&#39;],$str).&#39;<br>&#39;;
 
//类似:str_ireplace()你可能已经猜到了,这是不区分被替换字符串大小写的替换
echo str_ireplace(&#39;php&#39;,&#39;python&#39;,$str).&#39;<hr>&#39;;
 
 
 
//二、substr_replace($str, $object, $offset, $length),$offset和$length指定了替换的索引区间
//从0开始替换到$str结束,用新字符串:PHP是最好的编程语言
echo substr_replace($str,&#39;php是世界上最好的编程语言&#39;,0).&#39;<br>&#39;;
//等价于
echo substr_replace($str,&#39;php是世界上最好的编程语言&#39;,0,strlen($str)).&#39;<br>&#39;;
 
//在$str中插入字符
//插入后的结果如下: Peter Zhu is PHP中文网的PHP leture
//其中: PHP中文网 是插入的内容, $length=0,表示插入到这个位置
//第四个参数，就是要替换的长度
echo substr_replace($str,&#39;php中文网&#39;,13,0).&#39;<br>&#39;;
 
//将PHP替换成JAVA
echo substr_replace($str,&#39;java&#39;,13,3 ).&#39;<br>&#39;;
 
//删除指定区间内的字符,将新字符设置为空字符即可
//删除&#39;Zhu&#39;
echo substr_replace($str,&#39;&#39;,6,3),&#39;<br>&#39;;

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