How to perform string replacement in php

String replacement method: 1. Use the str_replace() function, the syntax "str_replace(search value, replacement value, string)"; 2. Use the substr_replace() function, the syntax "substr_replace(string, replace value, starting position, replacement length)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In PHP, you can edit a string Replace specific characters or substrings, which is a very common function.

php string replacement

Method 1: str_ireplace() and str_replace() functions

str_ireplace() and str_replace use a new string to replace a specific string specified in the original string. str_replace is case-sensitive, while str_ireplace() is not case-sensitive. The syntax of the two is similar.

str_replace(find,replace,string,count)
str_ireplace(find,replace,string,count)

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;hello,world,Hello,world&#39;;
echo "原字符串：".$str."<br>";

$search = &#39;hello&#39;;
$replace = &#39;hi&#39;;

echo "<br>替换字符串：<br>";
echo str_replace($search, $replace, $str)."<br>";
echo str_ireplace($search, $replace, $str)."<br>";
?>

Method 2: substr_replace() function

substr_replace() function replaces part of a string with another string.

The syntax of the substr_replace() function is as follows:

substr_replace(string,replacement,start,length)

<?php
$str = &#39;hello,world,hello,world&#39;;
$replace = &#39;hi&#39;;
echo substr_replace($str, $replace, 0,5);
?>

hi,world,hello,world

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