How to remove extra commas in php

How to remove extra commas in php: 1. Remove the first and last commas through "trim($arr1,',')"; 2. Remove the last commas through "rtrim($arr1,',')" comma; 3. Remove the first comma through "ltrim($arr1,',')".

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

php How to remove extra commas?

Remove commas after splicing strings in php

When using some string splicing, there will always be a comma at the end. Previously, the method was used to determine the removal. Comma, but it was so troublesome. Later I found a very simple way to use trim to remove

$arr1 = trim($arr1,',');    //移除首尾的逗号
$arr1 = rtrim($arr1,',');    //移除尾的逗号
$arr1 = ltrim($arr1,',');    //移除首的逗号
echo $arr1;

and this solved the problem

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