How to delete a specified substring in a string in php

Method: 1. Use str_replace() to delete in a case-sensitive manner, syntax "str_replace(substring,'', string)"; 2. Use str_ireplace() to delete in a case-insensitive manner Delete, syntax "str_ireplace(substring,'',string)".

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

In php, I want to delete the string The specified substring can be replaced by replacing the specified substring in a string with the empty string ''.

To replace a specified substring, you can use the str_ireplace() and str_replace functions. They will use a new string to replace the specific string specified in the original string. str_replace is case-sensitive, and str_ireplace() is not size-sensitive. Write, the syntax of the two is similar:

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

Parameter	Description
find	Required. Specifies the value to look for.
replace	Required. Specifies a value that replaces the value in find.
string	Required. Specifies the string to be searched for.
count	Optional. A variable counting the number of substitutions.

Just set the replace parameter value to the empty string ''.

Example 1: Use the str_replace() function to remove the specified substring "hello"

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;hello,world,Hello,World&#39;;
$replace = &#39;&#39;;
$search = &#39;hello&#39;;
echo str_replace($search, $replace, $str);
?>

Output result:

Example 2: Use the str_ireplace() function to remove the specified substring "hello"

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;hello,world,Hello,World&#39;;
$replace = &#39;&#39;;
$search = &#39;hello&#39;;
echo str_ireplace($search, $replace, $str);
?>

Output result:

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