How to replace 1 character in php string

Method to replace one character: 1. Use the "str_replace("single character", "replacement value", string)" statement to replace the specified single character in a case-sensitive manner; 2. Use " The substr_replace(string, "replacement value", starting position, 1)" statement can replace a character starting from the specified position.

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

php string replacement 1-character method:

1. Use the str_replace() function

str_replace() function can replace the specified single character in a case-sensitive manner. character.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "abCdABcD";
echo "原字符串：".$str;
$replace = &#39;-&#39;;
$search = &#39;b&#39;;
echo "<br>替换后：".str_replace($search, $replace, $str);
?>

Note: PHP also has a str_ireplace() function that is similar to str_replace(), but is not case-sensitive.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "abCdABcD";
echo "原字符串：".$str;
$replace = &#39;-&#39;;
$search = &#39;b&#39;;
echo "<br>替换后：".str_ireplace($search, $replace, $str);
?>

2. Use substr_replace() function

substr_replace() function can replace a character starting from the specified position.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "abCdABcD";
echo "原字符串：".$str;
echo "<br>替换后：".substr_replace($str,"#",2,1);
?>

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