How to convert underscore to comma in php

3 methods: 1. Use the "str_replace("_",",",$str)" statement to find the underscore and replace it with a comma; 2. Use "str_ireplace("_"," ,",$str)" statement; 3. Use "preg_filter("/_/",",",$str)".

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

php Convert the underscore to a comma Method: Find the underscore in the string and replace it with a comma.

You can use the following 3 methods to implement search and replacement:

Method 1: Use str_replace() function

<?php
$str = &#39;1_2_3_44678_5_&#39;;
echo str_replace("_",",",$str);
?>

Method 2: Use str_ireplace() function

<?php
$str = &#39;1_2_3_44678_5_&#39;;
echo $str."<br>";
echo str_ireplace("_",",",$str);
?>

Description: str_ireplace() and str_replace have similar syntax, and both Use a new string to replace a specific string specified in the original string; but str_replace is case-sensitive, str_ireplace() is not case-sensitive

Method 3: Use preg_replace()

The preg_replace() function can be used with regular expressions to find all underscores and replace them with commas.

<?php
$str = &#39;3_44678_5_&#39;;
echo $str."<br>";
echo preg_filter("/_/", ",", $str);
?>

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