How to convert md5 results to uppercase in php

In web development, encryption is a very important task. For irreversible Hash encryption, its function is to convert the original data into summary information that is difficult to recover, thereby achieving the purpose of keeping the data confidential. In PHP, MD5 encryption is a very common method, but the MD5 summary information generated by default is lowercase letters. In order to facilitate control, we sometimes need to convert it to uppercase letters. This article will focus on how to convert MD5 results to uppercase letters in PHP.

1. Direct conversion in the MD5 function

PHP directly provides the MD5 encryption function in the form of a function. You can use this function to perform MD5 encryption on the information that needs to be encrypted. When encrypting, you can use the strtoupper() function to convert the result to uppercase letters. The sample code is as follows:

<?php echo strtoupper(md5(&#39;password&#39;));
// 输出: 5F4DCC3B5AA765D61D8327DEB882CF99
?>

2. Custom function to implement conversion

In addition to using the strtoupper() function for conversion, you can also customize a function to implement this function. The idea of ​​using a custom function to implement MD5 encryption and convert it to uppercase letters is to use PHP's str_replace() function to replace all lowercase letters in the string with uppercase letters after MD5 encrypting the string. As shown below:

<?php  
function md5UpperCase($str){
    $md5_str = md5($str);
    return str_replace(range(&#39;a&#39;, &#39;z&#39;), range(&#39;A&#39;,&#39;Z&#39;), $md5_str);
}
echo md5UpperCase(&#39;password&#39;);
// 输出: 5F4DCC3B5AA765D61D8327DEB882CF99
?>

With this method, we can realize the function of converting the results generated by MD5 into uppercase letters in PHP.

Summary

In PHP development, MD5 encryption is a very common method, but the MD5 encryption result generated by default is lowercase letters. We sometimes need to convert it to uppercase letters for more effect and control. This article introduces how to convert the results generated by MD5 into uppercase letters in PHP in two ways. Whether it is converted directly in the md5 function or implemented by a custom function, it is a very simple and easy-to-use method.

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